Remove step to assert that string-as-assets files exist.
Remove step to assert that string-as-assets files exist.

Summary:
I added this back when I was debugging why some APKs were missing the string
asset files. It's been a while since I fixed the bug, so remove this.

Test Plan: buck test --all

ilya-klyuchnikov/buck,stuhood/buck,sdwilsh/buck,sdwilsh/buck,Learn-Android-app/buck,k21/buck,robbertvanginkel/buck,saleeh93/buck-cutom,LegNeato/buck,stuhood/buck,Learn-Android-app/buck,Dominator008/buck,artiya4u/buck,Heart2009/buck,vine/buck,liuyang-li/buck,neonichu/buck,romanoid/buck,mikekap/buck,OkBuilds/buck,1yvT0s/buck,Learn-Android-app/buck,lukw00/buck,clonetwin26/buck,luiseduardohdbackup/buck,darkforestzero/buck,lukw00/buck,davido/buck,Heart2009/buck,stuhood/buck,mikekap/buck,LegNeato/buck,Addepar/buck,JoelMarcey/buck,dpursehouse/buck,ilya-klyuchnikov/buck,1yvT0s/buck,pwz3n0/buck,bocon13/buck,zhuxiaohao/buck,darkforestzero/buck,lukw00/buck,vschs007/buck,marcinkwiatkowski/buck,justinmuller/buck,raviagarwal7/buck,romanoid/buck,JoelMarcey/buck,rowillia/buck,Addepar/buck,k21/buck,dsyang/buck,robbertvanginkel/buck,siddhartharay007/buck,bocon13/buck,rmaz/buck,kageiit/buck,k21/buck,shs96c/buck,neonichu/buck,robbertvanginkel/buck,JoelMarcey/buck,luiseduardohdbackup/buck,1yvT0s/buck,artiya4u/buck,rowillia/buck,shs96c/buck,romanoid/buck,siddhartharay007/buck,OkBuilds/buck,darkforestzero/buck,illicitonion/buck,mogers/buck,illicitonion/buck,sdwilsh/buck,grumpyjames/buck,shs96c/buck,LegNeato/buck,illicitonion/buck,zhan-xiong/buck,sdwilsh/buck,sdwilsh/buck,liuyang-li/buck,Dominator008/buck,tgummerer/buck,shs96c/buck,justinmuller/buck,janicduplessis/buck,LegNeato/buck,zhan-xiong/buck,zpao/buck,ilya-klyuchnikov/buck,pwz3n0/buck,rhencke/buck,dsyang/buck,siddhartharay007/buck,rmaz/buck,rmaz/buck,hgl888/buck,janicduplessis/buck,pwz3n0/buck,shs96c/buck,dsyang/buck,dushmis/buck,davido/buck,dsyang/buck,janicduplessis/buck,clonetwin26/buck,dsyang/buck,raviagarwal7/buck,facebook/buck,rowillia/buck,ilya-klyuchnikov/buck,shybovycha/buck,illicitonion/buck,Dominator008/buck,dushmis/buck,pwz3n0/buck,Distrotech/buck,clonetwin26/buck,LegNeato/buck,ilya-klyuchnikov/buck,mikekap/buck,Dominator008/buck,clonetwin26/buck,Dominator008/buck,rowillia/buck,romanoid/buck,davido/buck,romanoid/buck,daedric/buck,zhan-xiong/buck,Addepar/buck,mread/buck,brettwooldridge/buck,lukw00/buck,janicduplessis/buck,marcinkwiatkowski/buck,dsyang/buck,ilya-klyuchnikov/buck,facebook/buck,LegNeato/buck,grumpyjames/buck,grumpyjames/buck,mnuessler/buck,Distrotech/buck,dushmis/buck,marcinkwiatkowski/buck,mogers/buck,JoelMarcey/buck,OkBuilds/buck,Distrotech/buck,JoelMarcey/buck,mogers/buck,MarkRunWu/buck,hgl888/buck,tgummerer/buck,zhuxiaohao/buck,lukw00/buck,lukw00/buck,mikekap/buck,sdwilsh/buck,pwz3n0/buck,davido/buck,clonetwin26/buck,dushmis/buck,vschs007/buck,illicitonion/buck,hgl888/buck,bocon13/buck,vine/buck,robbertvanginkel/buck,kageiit/buck,mogers/buck,stuhood/buck,zpao/buck,darkforestzero/buck,luiseduardohdbackup/buck,pwz3n0/buck,Heart2009/buck,zhuxiaohao/buck,Dominator008/buck,stuhood/buck,siddhartharay007/buck,OkBuilds/buck,clonetwin26/buck,shybovycha/buck,illicitonion/buck,Heart2009/buck,mread/buck,LegNeato/buck,zpao/buck,dsyang/buck,rhencke/buck,vine/buck,justinmuller/buck,shs96c/buck,Heart2009/buck,illicitonion/buck,rmaz/buck,shybovycha/buck,zpao/buck,Dominator008/buck,lukw00/buck,davido/buck,mnuessler/buck,zhan-xiong/buck,liuyang-li/buck,grumpyjames/buck,Distrotech/buck,sdwilsh/buck,raviagarwal7/buck,liuyang-li/buck,mogers/buck,zhuxiaohao/buck,saleeh93/buck-cutom,grumpyjames/buck,dpursehouse/buck,saleeh93/buck-cutom,darkforestzero/buck,rmaz/buck,raviagarwal7/buck,Learn-Android-app/buck,neonichu/buck,mogers/buck,bocon13/buck,mnuessler/buck,Addepar/buck,mogers/buck,illicitonion/buck,raviagarwal7/buck,kageiit/buck,lukw00/buck,mikekap/buck,raviagarwal7/buck,daedric/buck,ilya-klyuchnikov/buck,MarkRunWu/buck,tgummerer/buck,Distrotech/buck,marcinkwiatkowski/buck,zhuxiaohao/buck,dushmis/buck,janicduplessis/buck,LegNeato/buck,daedric/buck,tgummerer/buck,Dominator008/buck,Addepar/buck,mread/buck,siddhartharay007/buck,rmaz/buck,tgummerer/buck,shybovycha/buck,1yvT0s/buck,dpursehouse/buck,vine/buck,luiseduardohdbackup/buck,k21/buck,clonetwin26/buck,dpursehouse/buck,justinmuller/buck,hgl888/buck,brettwooldridge/buck,zhan-xiong/buck,SeleniumHQ/buck,dushmis/buck,brettwooldridge/buck,zpao/buck,artiya4u/buck,raviagarwal7/buck,k21/buck,vschs007/buck,rmaz/buck,daedric/buck,k21/buck,lukw00/buck,hgl888/buck,illicitonion/buck,mogers/buck,facebook/buck,JoelMarcey/buck,brettwooldridge/buck,dsyang/buck,brettwooldridge/buck,dushmis/buck,hgl888/buck,1yvT0s/buck,sdwilsh/buck,dpursehouse/buck,lukw00/buck,darkforestzero/buck,zpao/buck,luiseduardohdbackup/buck,mikekap/buck,mnuessler/buck,tgummerer/buck,JoelMarcey/buck,grumpyjames/buck,ilya-klyuchnikov/buck,mread/buck,shybovycha/buck,pwz3n0/buck,darkforestzero/buck,neonichu/buck,Heart2009/buck,justinmuller/buck,Learn-Android-app/buck,rowillia/buck,janicduplessis/buck,grumpyjames/buck,rmaz/buck,bocon13/buck,SeleniumHQ/buck,shybovycha/buck,brettwooldridge/buck,brettwooldridge/buck,brettwooldridge/buck,SeleniumHQ/buck,siddhartharay007/buck,grumpyjames/buck,Learn-Android-app/buck,luiseduardohdbackup/buck,mogers/buck,rowillia/buck,Addepar/buck,clonetwin26/buck,shs96c/buck,brettwooldridge/buck,bocon13/buck,tgummerer/buck,dsyang/buck,SeleniumHQ/buck,OkBuilds/buck,rhencke/buck,romanoid/buck,pwz3n0/buck,luiseduardohdbackup/buck,bocon13/buck,justinmuller/buck,mread/buck,JoelMarcey/buck,pwz3n0/buck,justinmuller/buck,nguyentruongtho/buck,OkBuilds/buck,raviagarwal7/buck,romanoid/buck,grumpyjames/buck,Learn-Android-app/buck,janicduplessis/buck,davido/buck,Distrotech/buck,liuyang-li/buck,dsyang/buck,Learn-Android-app/buck,rmaz/buck,brettwooldridge/buck,Distrotech/buck,nguyentruongtho/buck,darkforestzero/buck,JoelMarcey/buck,vschs007/buck,rhencke/buck,grumpyjames/buck,marcinkwiatkowski/buck,zhan-xiong/buck,grumpyjames/buck,vine/buck,shs96c/buck,vschs007/buck,LegNeato/buck,justinmuller/buck,Learn-Android-app/buck,dpursehouse/buck,zhuxiaohao/buck,illicitonion/buck,saleeh93/buck-cutom,janicduplessis/buck,neonichu/buck,zhan-xiong/buck,robbertvanginkel/buck,shybovycha/buck,shybovycha/buck,bocon13/buck,Heart2009/buck,shs96c/buck,romanoid/buck,liuyang-li/buck,bocon13/buck,clonetwin26/buck,bocon13/buck,raviagarwal7/buck,kageiit/buck,daedric/buck,mnuessler/buck,nguyentruongtho/buck,vine/buck,justinmuller/buck,raviagarwal7/buck,robbertvanginkel/buck,OkBuilds/buck,siddhartharay007/buck,janicduplessis/buck,rmaz/buck,siddhartharay007/buck,OkBuilds/buck,marcinkwiatkowski/buck,robbertvanginkel/buck,robbertvanginkel/buck,romanoid/buck,daedric/buck,rowillia/buck,liuyang-li/buck,shs96c/buck,LegNeato/buck,SeleniumHQ/buck,OkBuilds/buck,mnuessler/buck,neonichu/buck,justinmuller/buck,stuhood/buck,tgummerer/buck,rowillia/buck,JoelMarcey/buck,daedric/buck,raviagarwal7/buck,artiya4u/buck,vschs007/buck,Addepar/buck,saleeh93/buck-cutom,dpursehouse/buck,SeleniumHQ/buck,mogers/buck,darkforestzero/buck,artiya4u/buck,robbertvanginkel/buck,OkBuilds/buck,facebook/buck,marcinkwiatkowski/buck,davido/buck,MarkRunWu/buck,k21/buck,artiya4u/buck,MarkRunWu/buck,clonetwin26/buck,SeleniumHQ/buck,mnuessler/buck,OkBuilds/buck,vine/buck,sdwilsh/buck,darkforestzero/buck,clonetwin26/buck,Heart2009/buck,justinmuller/buck,mikekap/buck,ilya-klyuchnikov/buck,vine/buck,robbertvanginkel/buck,Addepar/buck,Addepar/buck,zhan-xiong/buck,darkforestzero/buck,nguyentruongtho/buck,raviagarwal7/buck,rhencke/buck,nguyentruongtho/buck,MarkRunWu/buck,LegNeato/buck,dushmis/buck,romanoid/buck,artiya4u/buck,ilya-klyuchnikov/buck,mikekap/buck,shybovycha/buck,davido/buck,artiya4u/buck,vschs007/buck,rhencke/buck,liuyang-li/buck,rmaz/buck,Learn-Android-app/buck,SeleniumHQ/buck,Addepar/buck,hgl888/buck,illicitonion/buck,shs96c/buck,vschs007/buck,rhencke/buck,ilya-klyuchnikov/buck,Dominator008/buck,shs96c/buck,daedric/buck,artiya4u/buck,mikekap/buck,k21/buck,darkforestzero/buck,neonichu/buck,stuhood/buck,luiseduardohdbackup/buck,zhan-xiong/buck,vschs007/buck,marcinkwiatkowski/buck,rmaz/buck,shs96c/buck,Distrotech/buck,raviagarwal7/buck,siddhartharay007/buck,liuyang-li/buck,OkBuilds/buck,bocon13/buck,mikekap/buck,romanoid/buck,rowillia/buck,artiya4u/buck,shybovycha/buck,LegNeato/buck,SeleniumHQ/buck,mnuessler/buck,tgummerer/buck,Distrotech/buck,k21/buck,marcinkwiatkowski/buck,daedric/buck,janicduplessis/buck,zhan-xiong/buck,MarkRunWu/buck,shybovycha/buck,facebook/buck,LegNeato/buck,JoelMarcey/buck,shybovycha/buck,justinmuller/buck,Addepar/buck,daedric/buck,ilya-klyuchnikov/buck,marcinkwiatkowski/buck,JoelMarcey/buck,rhencke/buck,mnuessler/buck,hgl888/buck,rhencke/buck,1yvT0s/buck,vine/buck,stuhood/buck,SeleniumHQ/buck,vschs007/buck,justinmuller/buck,vine/buck,zhuxiaohao/buck,davido/buck,vschs007/buck,davido/buck,robbertvanginkel/buck,SeleniumHQ/buck,neonichu/buck,clonetwin26/buck,illicitonion/buck,janicduplessis/buck,stuhood/buck,k21/buck,dsyang/buck,davido/buck,brettwooldridge/buck,rowillia/buck,mikekap/buck,robbertvanginkel/buck,k21/buck,davido/buck,MarkRunWu/buck,marcinkwiatkowski/buck,tgummerer/buck,vschs007/buck,zhan-xiong/buck,sdwilsh/buck,dsyang/buck,zhan-xiong/buck,dpursehouse/buck,Learn-Android-app/buck,JoelMarcey/buck,neonichu/buck,1yvT0s/buck,1yvT0s/buck,SeleniumHQ/buck,vschs007/buck,artiya4u/buck,tgummerer/buck,zhuxiaohao/buck,stuhood/buck,sdwilsh/buck,davido/buck,brettwooldridge/buck,clonetwin26/buck,k21/buck,sdwilsh/buck,nguyentruongtho/buck,sdwilsh/buck,rowillia/buck,saleeh93/buck-cutom,bocon13/buck,kageiit/buck,luiseduardohdbackup/buck,mikekap/buck,MarkRunWu/buck,rhencke/buck,dushmis/buck,rhencke/buck,SeleniumHQ/buck,daedric/buck,liuyang-li/buck,nguyentruongtho/buck,brettwooldridge/buck,daedric/buck,dushmis/buck,facebook/buck,Dominator008/buck,kageiit/buck,hgl888/buck,Distrotech/buck,Heart2009/buck,darkforestzero/buck,pwz3n0/buck,stuhood/buck,zhuxiaohao/buck,daedric/buck,Dominator008/buck,illicitonion/buck,ilya-klyuchnikov/buck,zhan-xiong/buck,janicduplessis/buck,Distrotech/buck,mogers/buck,pwz3n0/buck,marcinkwiatkowski/buck,k21/buck,dsyang/buck,romanoid/buck,grumpyjames/buck,1yvT0s/buck,Dominator008/buck,liuyang-li/buck,Addepar/buck,rmaz/buck,Addepar/buck,OkBuilds/buck,mread/buck,vine/buck,rowillia/buck,zpao/buck,marcinkwiatkowski/buck,lukw00/buck,kageiit/buck,robbertvanginkel/buck,facebook/buck,shybovycha/buck,romanoid/buck