Remove some dead code in stream_list.js.
Remove some dead code in stream_list.js.

I forgot to remove this code in a recent refactoring that copied
this code into activity.js.  It should not have caused any errors,
but it's no longer needed.

brainwane/zulip,jphilipsen05/zulip,grave-w-grave/zulip,synicalsyntax/zulip,jainayush975/zulip,sharmaeklavya2/zulip,ryanbackman/zulip,sharmaeklavya2/zulip,blaze225/zulip,jphilipsen05/zulip,verma-varsha/zulip,tommyip/zulip,peguin40/zulip,isht3/zulip,zulip/zulip,eeshangarg/zulip,punchagan/zulip,punchagan/zulip,amanharitsh123/zulip,reyha/zulip,cosmicAsymmetry/zulip,jackrzhang/zulip,joyhchen/zulip,dhcrzf/zulip,brainwane/zulip,joyhchen/zulip,jrowan/zulip,verma-varsha/zulip,hackerkid/zulip,brockwhittaker/zulip,tommyip/zulip,sonali0901/zulip,JPJPJPOPOP/zulip,j831/zulip,TigorC/zulip,punchagan/zulip,shubhamdhama/zulip,dhcrzf/zulip,isht3/zulip,Jianchun1/zulip,mahim97/zulip,Diptanshu8/zulip,zacps/zulip,shubhamdhama/zulip,dhcrzf/zulip,zulip/zulip,Galexrt/zulip,zacps/zulip,rishig/zulip,PhilSk/zulip,zulip/zulip,JPJPJPOPOP/zulip,aakash-cr7/zulip,Galexrt/zulip,samatdav/zulip,jphilipsen05/zulip,shubhamdhama/zulip,tommyip/zulip,j831/zulip,dhcrzf/zulip,amyliu345/zulip,SmartPeople/zulip,tommyip/zulip,isht3/zulip,grave-w-grave/zulip,niftynei/zulip,jrowan/zulip,christi3k/zulip,blaze225/zulip,dattatreya303/zulip,souravbadami/zulip,hackerkid/zulip,cosmicAsymmetry/zulip,dawran6/zulip,ryanbackman/zulip,cosmicAsymmetry/zulip,vabs22/zulip,susansls/zulip,paxapy/zulip,peguin40/zulip,andersk/zulip,arpith/zulip,AZtheAsian/zulip,ryanbackman/zulip,andersk/zulip,punchagan/zulip,shubhamdhama/zulip,Jianchun1/zulip,zulip/zulip,dhcrzf/zulip,jainayush975/zulip,vaidap/zulip,rht/zulip,souravbadami/zulip,hackerkid/zulip,joyhchen/zulip,sharmaeklavya2/zulip,vikas-parashar/zulip,synicalsyntax/zulip,Galexrt/zulip,jainayush975/zulip,paxapy/zulip,arpith/zulip,paxapy/zulip,brainwane/zulip,SmartPeople/zulip,Galexrt/zulip,shubhamdhama/zulip,synicalsyntax/zulip,Jianchun1/zulip,shubhamdhama/zulip,JPJPJPOPOP/zulip,jainayush975/zulip,susansls/zulip,showell/zulip,amyliu345/zulip,sharmaeklavya2/zulip,rishig/zulip,vaidap/zulip,vabs22/zulip,isht3/zulip,Diptanshu8/zulip,zacps/zulip,arpith/zulip,amyliu345/zulip,j831/zulip,dawran6/zulip,sharmaeklavya2/zulip,susansls/zulip,rht/zulip,calvinleenyc/zulip,Juanvulcano/zulip,hackerkid/zulip,Juanvulcano/zulip,shubhamdhama/zulip,vabs22/zulip,timabbott/zulip,andersk/zulip,kou/zulip,isht3/zulip,verma-varsha/zulip,mahim97/zulip,PhilSk/zulip,rishig/zulip,amanharitsh123/zulip,PhilSk/zulip,zacps/zulip,peguin40/zulip,kou/zulip,dattatreya303/zulip,sonali0901/zulip,jrowan/zulip,vikas-parashar/zulip,brockwhittaker/zulip,Juanvulcano/zulip,punchagan/zulip,dhcrzf/zulip,kou/zulip,hackerkid/zulip,vaidap/zulip,jphilipsen05/zulip,christi3k/zulip,rishig/zulip,souravbadami/zulip,tommyip/zulip,mahim97/zulip,blaze225/zulip,jrowan/zulip,niftynei/zulip,calvinleenyc/zulip,j831/zulip,amanharitsh123/zulip,TigorC/zulip,vaidap/zulip,eeshangarg/zulip,dattatreya303/zulip,mahim97/zulip,souravbadami/zulip,Galexrt/zulip,paxapy/zulip,eeshangarg/zulip,TigorC/zulip,synicalsyntax/zulip,christi3k/zulip,zacps/zulip,cosmicAsymmetry/zulip,JPJPJPOPOP/zulip,susansls/zulip,brockwhittaker/zulip,sharmaeklavya2/zulip,vikas-parashar/zulip,zulip/zulip,eeshangarg/zulip,AZtheAsian/zulip,susansls/zulip,dattatreya303/zulip,timabbott/zulip,TigorC/zulip,hackerkid/zulip,reyha/zulip,j831/zulip,AZtheAsian/zulip,rht/zulip,amanharitsh123/zulip,showell/zulip,verma-varsha/zulip,PhilSk/zulip,TigorC/zulip,dhcrzf/zulip,arpith/zulip,jackrzhang/zulip,JPJPJPOPOP/zulip,souravbadami/zulip,Diptanshu8/zulip,Galexrt/zulip,joyhchen/zulip,rishig/zulip,dattatreya303/zulip,aakash-cr7/zulip,andersk/zulip,SmartPeople/zulip,niftynei/zulip,timabbott/zulip,timabbott/zulip,christi3k/zulip,susansls/zulip,paxapy/zulip,blaze225/zulip,ryanbackman/zulip,kou/zulip,samatdav/zulip,calvinleenyc/zulip,dawran6/zulip,sonali0901/zulip,cosmicAsymmetry/zulip,brainwane/zulip,showell/zulip,synicalsyntax/zulip,samatdav/zulip,amyliu345/zulip,timabbott/zulip,tommyip/zulip,KingxBanana/zulip,brainwane/zulip,samatdav/zulip,brockwhittaker/zulip,Juanvulcano/zulip,niftynei/zulip,brainwane/zulip,aakash-cr7/zulip,jrowan/zulip,andersk/zulip,christi3k/zulip,andersk/zulip,showell/zulip,rht/zulip,vabs22/zulip,zacps/zulip,SmartPeople/zulip,amyliu345/zulip,punchagan/zulip,SmartPeople/zulip,showell/zulip,ryanbackman/zulip,sonali0901/zulip,vaidap/zulip,KingxBanana/zulip,dawran6/zulip,synicalsyntax/zulip,rht/zulip,vikas-parashar/zulip,brockwhittaker/zulip,kou/zulip,KingxBanana/zulip,jphilipsen05/zulip,vikas-parashar/zulip,hackerkid/zulip,rht/zulip,jainayush975/zulip,eeshangarg/zulip,paxapy/zulip,grave-w-grave/zulip,AZtheAsian/zulip,jackrzhang/zulip,Diptanshu8/zulip,peguin40/zulip,blaze225/zulip,joyhchen/zulip,amanharitsh123/zulip,kou/zulip,Juanvulcano/zulip,reyha/zulip,aakash-cr7/zulip,jackrzhang/zulip,reyha/zulip,brainwane/zulip,sonali0901/zulip,showell/zulip,j831/zulip,grave-w-grave/zulip,Jianchun1/zulip,aakash-cr7/zulip,KingxBanana/zulip,jphilipsen05/zulip,christi3k/zulip,isht3/zulip,souravbadami/zulip,punchagan/zulip,JPJPJPOPOP/zulip,rishig/zulip,vabs22/zulip,PhilSk/zulip,vikas-parashar/zulip,niftynei/zulip,eeshangarg/zulip,jainayush975/zulip,jrowan/zulip,vaidap/zulip,rht/zulip,arpith/zulip,timabbott/zulip,grave-w-grave/zulip,Jianchun1/zulip,timabbott/zulip,kou/zulip,showell/zulip,blaze225/zulip,samatdav/zulip,KingxBanana/zulip,andersk/zulip,PhilSk/zulip,amyliu345/zulip,synicalsyntax/zulip,Juanvulcano/zulip,TigorC/zulip,calvinleenyc/zulip,mahim97/zulip,rishig/zulip,brockwhittaker/zulip,jackrzhang/zulip,joyhchen/zulip,SmartPeople/zulip,Diptanshu8/zulip,calvinleenyc/zulip,peguin40/zulip,dawran6/zulip,eeshangarg/zulip,verma-varsha/zulip,reyha/zulip,sonali0901/zulip,samatdav/zulip,zulip/zulip,ryanbackman/zulip,grave-w-grave/zulip,jackrzhang/zulip,AZtheAsian/zulip,Diptanshu8/zulip,Jianchun1/zulip,mahim97/zulip,niftynei/zulip,reyha/zulip,calvinleenyc/zulip,AZtheAsian/zulip,Galexrt/zulip,vabs22/zulip,peguin40/zulip,dawran6/zulip,verma-varsha/zulip,dattatreya303/zulip,amanharitsh123/zulip,cosmicAsymmetry/zulip,jackrzhang/zulip,arpith/zulip,aakash-cr7/zulip,KingxBanana/zulip,zulip/zulip,tommyip/zulip