message_edit: Make enter save when editing topics.
message_edit: Make enter save when editing topics.

Fixes #1272.

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