bugdown: Fix extraction of titles for uploaded files.
bugdown: Fix extraction of titles for uploaded files.

The previous code was associated with a previous version of the upload
URL naming scheme, and thus never triggered in practice.

kou/zulip,hackerkid/zulip,susansls/zulip,Diptanshu8/zulip,vabs22/zulip,dhcrzf/zulip,tommyip/zulip,PhilSk/zulip,synicalsyntax/zulip,shubhamdhama/zulip,cosmicAsymmetry/zulip,reyha/zulip,dhcrzf/zulip,arpith/zulip,mohsenSy/zulip,calvinleenyc/zulip,zulip/zulip,sup95/zulip,showell/zulip,niftynei/zulip,calvinleenyc/zulip,tommyip/zulip,AZtheAsian/zulip,eeshangarg/zulip,krtkmj/zulip,brainwane/zulip,vaidap/zulip,mahim97/zulip,Juanvulcano/zulip,peguin40/zulip,shubhamdhama/zulip,vaidap/zulip,cosmicAsymmetry/zulip,brockwhittaker/zulip,blaze225/zulip,dhcrzf/zulip,andersk/zulip,AZtheAsian/zulip,KingxBanana/zulip,ahmadassaf/zulip,samatdav/zulip,jackrzhang/zulip,christi3k/zulip,Juanvulcano/zulip,Galexrt/zulip,susansls/zulip,reyha/zulip,kou/zulip,Diptanshu8/zulip,synicalsyntax/zulip,timabbott/zulip,dattatreya303/zulip,blaze225/zulip,aakash-cr7/zulip,rht/zulip,sonali0901/zulip,grave-w-grave/zulip,vabs22/zulip,rht/zulip,krtkmj/zulip,punchagan/zulip,brockwhittaker/zulip,jrowan/zulip,ryanbackman/zulip,shubhamdhama/zulip,isht3/zulip,christi3k/zulip,cosmicAsymmetry/zulip,peguin40/zulip,cosmicAsymmetry/zulip,brainwane/zulip,eeshangarg/zulip,ryanbackman/zulip,dawran6/zulip,vaidap/zulip,sup95/zulip,amanharitsh123/zulip,mahim97/zulip,showell/zulip,andersk/zulip,amanharitsh123/zulip,SmartPeople/zulip,niftynei/zulip,zulip/zulip,souravbadami/zulip,umkay/zulip,dawran6/zulip,showell/zulip,dhcrzf/zulip,punchagan/zulip,vaidap/zulip,SmartPeople/zulip,peguin40/zulip,susansls/zulip,amanharitsh123/zulip,Jianchun1/zulip,joyhchen/zulip,synicalsyntax/zulip,synicalsyntax/zulip,rishig/zulip,calvinleenyc/zulip,joyhchen/zulip,jackrzhang/zulip,tommyip/zulip,j831/zulip,dattatreya303/zulip,AZtheAsian/zulip,tommyip/zulip,sonali0901/zulip,tommyip/zulip,rishig/zulip,jrowan/zulip,verma-varsha/zulip,Galexrt/zulip,cosmicAsymmetry/zulip,aakash-cr7/zulip,dawran6/zulip,KingxBanana/zulip,Galexrt/zulip,jrowan/zulip,PhilSk/zulip,eeshangarg/zulip,paxapy/zulip,souravbadami/zulip,PhilSk/zulip,christi3k/zulip,grave-w-grave/zulip,isht3/zulip,j831/zulip,kou/zulip,mohsenSy/zulip,rishig/zulip,zulip/zulip,souravbadami/zulip,KingxBanana/zulip,Jianchun1/zulip,tommyip/zulip,umkay/zulip,Diptanshu8/zulip,JPJPJPOPOP/zulip,amanharitsh123/zulip,timabbott/zulip,shubhamdhama/zulip,AZtheAsian/zulip,jackrzhang/zulip,amyliu345/zulip,JPJPJPOPOP/zulip,reyha/zulip,dattatreya303/zulip,timabbott/zulip,amanharitsh123/zulip,peguin40/zulip,Jianchun1/zulip,peguin40/zulip,ahmadassaf/zulip,punchagan/zulip,sup95/zulip,andersk/zulip,niftynei/zulip,blaze225/zulip,rishig/zulip,isht3/zulip,vabs22/zulip,vikas-parashar/zulip,ahmadassaf/zulip,vaidap/zulip,jackrzhang/zulip,vikas-parashar/zulip,Diptanshu8/zulip,JPJPJPOPOP/zulip,brockwhittaker/zulip,hackerkid/zulip,aakash-cr7/zulip,arpith/zulip,TigorC/zulip,umkay/zulip,susansls/zulip,dawran6/zulip,brainwane/zulip,Juanvulcano/zulip,sharmaeklavya2/zulip,blaze225/zulip,jainayush975/zulip,samatdav/zulip,SmartPeople/zulip,timabbott/zulip,vabs22/zulip,verma-varsha/zulip,Juanvulcano/zulip,ahmadassaf/zulip,SmartPeople/zulip,calvinleenyc/zulip,punchagan/zulip,niftynei/zulip,JPJPJPOPOP/zulip,JPJPJPOPOP/zulip,jainayush975/zulip,dhcrzf/zulip,umkay/zulip,umkay/zulip,sup95/zulip,hackerkid/zulip,zacps/zulip,aakash-cr7/zulip,souravbadami/zulip,paxapy/zulip,AZtheAsian/zulip,vikas-parashar/zulip,rht/zulip,AZtheAsian/zulip,TigorC/zulip,niftynei/zulip,kou/zulip,brainwane/zulip,reyha/zulip,eeshangarg/zulip,sonali0901/zulip,jainayush975/zulip,jphilipsen05/zulip,ryanbackman/zulip,dawran6/zulip,blaze225/zulip,isht3/zulip,showell/zulip,niftynei/zulip,verma-varsha/zulip,Juanvulcano/zulip,Galexrt/zulip,dhcrzf/zulip,JPJPJPOPOP/zulip,amanharitsh123/zulip,samatdav/zulip,joyhchen/zulip,mahim97/zulip,paxapy/zulip,shubhamdhama/zulip,brockwhittaker/zulip,rht/zulip,susansls/zulip,paxapy/zulip,punchagan/zulip,KingxBanana/zulip,jrowan/zulip,samatdav/zulip,sharmaeklavya2/zulip,krtkmj/zulip,ryanbackman/zulip,jphilipsen05/zulip,PhilSk/zulip,timabbott/zulip,Galexrt/zulip,umkay/zulip,christi3k/zulip,verma-varsha/zulip,aakash-cr7/zulip,calvinleenyc/zulip,dattatreya303/zulip,Diptanshu8/zulip,timabbott/zulip,showell/zulip,andersk/zulip,amyliu345/zulip,amyliu345/zulip,rishig/zulip,ahmadassaf/zulip,grave-w-grave/zulip,eeshangarg/zulip,Juanvulcano/zulip,synicalsyntax/zulip,andersk/zulip,krtkmj/zulip,shubhamdhama/zulip,zacps/zulip,sonali0901/zulip,grave-w-grave/zulip,KingxBanana/zulip,mahim97/zulip,vikas-parashar/zulip,showell/zulip,kou/zulip,Diptanshu8/zulip,joyhchen/zulip,vikas-parashar/zulip,Jianchun1/zulip,vaidap/zulip,zulip/zulip,verma-varsha/zulip,mahim97/zulip,paxapy/zulip,arpith/zulip,SmartPeople/zulip,grave-w-grave/zulip,zacps/zulip,brainwane/zulip,TigorC/zulip,TigorC/zulip,isht3/zulip,susansls/zulip,joyhchen/zulip,zulip/zulip,zacps/zulip,hackerkid/zulip,PhilSk/zulip,jphilipsen05/zulip,arpith/zulip,punchagan/zulip,brainwane/zulip,showell/zulip,hackerkid/zulip,eeshangarg/zulip,umkay/zulip,jainayush975/zulip,zulip/zulip,jphilipsen05/zulip,rht/zulip,sharmaeklavya2/zulip,shubhamdhama/zulip,calvinleenyc/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