buddy list: Update huddles when you fetch PMs.
buddy list: Update huddles when you fetch PMs.

This fixes a bug with the group pm section of our
buddy list.  It wasn't updating when you fetched
old private messages.

We had been calling activity.process_loaded_messages() as
part of message_store.do_unread_count_updates(), which was
called sometimes unnecessarily and sometime not called when
we needed to get huddle info.

Now we call it when we need it most, which is when you
click on "Private Messages".

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