Fix enter key not deleting selected text in compose box.
Fix enter key not deleting selected text in compose box.

Fix #3889.

christi3k/zulip,PhilSk/zulip,amanharitsh123/zulip,synicalsyntax/zulip,JPJPJPOPOP/zulip,brainwane/zulip,mahim97/zulip,aakash-cr7/zulip,shubhamdhama/zulip,jackrzhang/zulip,j831/zulip,timabbott/zulip,vaidap/zulip,mahim97/zulip,jackrzhang/zulip,amanharitsh123/zulip,zulip/zulip,zulip/zulip,verma-varsha/zulip,kou/zulip,Galexrt/zulip,shubhamdhama/zulip,vaidap/zulip,hackerkid/zulip,punchagan/zulip,rishig/zulip,souravbadami/zulip,Galexrt/zulip,dattatreya303/zulip,zulip/zulip,brockwhittaker/zulip,jackrzhang/zulip,tommyip/zulip,tommyip/zulip,jphilipsen05/zulip,amanharitsh123/zulip,j831/zulip,eeshangarg/zulip,andersk/zulip,eeshangarg/zulip,rishig/zulip,jrowan/zulip,aakash-cr7/zulip,j831/zulip,hackerkid/zulip,brainwane/zulip,jainayush975/zulip,brainwane/zulip,rht/zulip,dhcrzf/zulip,christi3k/zulip,andersk/zulip,shubhamdhama/zulip,mahim97/zulip,brainwane/zulip,mahim97/zulip,jainayush975/zulip,synicalsyntax/zulip,JPJPJPOPOP/zulip,ryanbackman/zulip,vaidap/zulip,showell/zulip,brainwane/zulip,brainwane/zulip,jphilipsen05/zulip,synicalsyntax/zulip,dhcrzf/zulip,ryanbackman/zulip,PhilSk/zulip,jrowan/zulip,rishig/zulip,tommyip/zulip,dattatreya303/zulip,vaidap/zulip,eeshangarg/zulip,blaze225/zulip,rht/zulip,synicalsyntax/zulip,SmartPeople/zulip,JPJPJPOPOP/zulip,rht/zulip,amanharitsh123/zulip,shubhamdhama/zulip,dhcrzf/zulip,showell/zulip,dawran6/zulip,kou/zulip,showell/zulip,kou/zulip,rishig/zulip,dhcrzf/zulip,dhcrzf/zulip,andersk/zulip,j831/zulip,synicalsyntax/zulip,vabs22/zulip,punchagan/zulip,susansls/zulip,shubhamdhama/zulip,christi3k/zulip,rht/zulip,dattatreya303/zulip,ryanbackman/zulip,showell/zulip,hackerkid/zulip,vabs22/zulip,rishig/zulip,timabbott/zulip,SmartPeople/zulip,shubhamdhama/zulip,susansls/zulip,aakash-cr7/zulip,hackerkid/zulip,eeshangarg/zulip,brainwane/zulip,JPJPJPOPOP/zulip,eeshangarg/zulip,dhcrzf/zulip,Galexrt/zulip,SmartPeople/zulip,christi3k/zulip,dattatreya303/zulip,verma-varsha/zulip,jackrzhang/zulip,jrowan/zulip,dawran6/zulip,susansls/zulip,Galexrt/zulip,kou/zulip,blaze225/zulip,jrowan/zulip,timabbott/zulip,jphilipsen05/zulip,brockwhittaker/zulip,jphilipsen05/zulip,rht/zulip,vabs22/zulip,susansls/zulip,timabbott/zulip,SmartPeople/zulip,punchagan/zulip,dattatreya303/zulip,jainayush975/zulip,aakash-cr7/zulip,brockwhittaker/zulip,souravbadami/zulip,susansls/zulip,andersk/zulip,tommyip/zulip,hackerkid/zulip,PhilSk/zulip,brockwhittaker/zulip,souravbadami/zulip,jackrzhang/zulip,jackrzhang/zulip,vabs22/zulip,susansls/zulip,punchagan/zulip,timabbott/zulip,punchagan/zulip,eeshangarg/zulip,Galexrt/zulip,ryanbackman/zulip,blaze225/zulip,ryanbackman/zulip,andersk/zulip,timabbott/zulip,zulip/zulip,vabs22/zulip,j831/zulip,showell/zulip,kou/zulip,SmartPeople/zulip,synicalsyntax/zulip,dawran6/zulip,PhilSk/zulip,zulip/zulip,jackrzhang/zulip,showell/zulip,amanharitsh123/zulip,souravbadami/zulip,PhilSk/zulip,jainayush975/zulip,dawran6/zulip,zulip/zulip,Galexrt/zulip,jainayush975/zulip,vaidap/zulip,kou/zulip,kou/zulip,andersk/zulip,dattatreya303/zulip,verma-varsha/zulip,souravbadami/zulip,aakash-cr7/zulip,rishig/zulip,verma-varsha/zulip,synicalsyntax/zulip,hackerkid/zulip,shubhamdhama/zulip,punchagan/zulip,jrowan/zulip,dawran6/zulip,christi3k/zulip,jainayush975/zulip,brockwhittaker/zulip,vaidap/zulip,tommyip/zulip,dhcrzf/zulip,SmartPeople/zulip,souravbadami/zulip,blaze225/zulip,ryanbackman/zulip,tommyip/zulip,PhilSk/zulip,mahim97/zulip,aakash-cr7/zulip,andersk/zulip,jphilipsen05/zulip,rht/zulip,jphilipsen05/zulip,j831/zulip,punchagan/zulip,showell/zulip,vabs22/zulip,blaze225/zulip,christi3k/zulip,amanharitsh123/zulip,dawran6/zulip,rht/zulip,brockwhittaker/zulip,jrowan/zulip,mahim97/zulip,tommyip/zulip,JPJPJPOPOP/zulip,zulip/zulip,timabbott/zulip,verma-varsha/zulip,rishig/zulip,verma-varsha/zulip,Galexrt/zulip,JPJPJPOPOP/zulip,hackerkid/zulip,eeshangarg/zulip,blaze225/zulip