Remove duplicate loop in build_stream_list().
Remove duplicate loop in build_stream_list().

The code removed in this commit added pinned streams to a list
of elems, only to have them added again by the next block of code
(but more concisely).  Through some strange quirk of appendTo() this
never created user-facing bugs, but you could clearly see in the console
that it was doing double work.

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