test_render_mention_stream_api: Fix nondeterministic failures.
test_render_mention_stream_api: Fix nondeterministic failures.

This previously dependended on the stream ID for Denmark, which is not
a constant across all installations.

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