popovers.js: Fix keyboard shortcuts with copying link.
popovers.js: Fix keyboard shortcuts with copying link.

Fixes #5374.

hackerkid/zulip,timabbott/zulip,dhcrzf/zulip,dhcrzf/zulip,punchagan/zulip,mahim97/zulip,brockwhittaker/zulip,amanharitsh123/zulip,vabs22/zulip,rht/zulip,synicalsyntax/zulip,vaidap/zulip,eeshangarg/zulip,eeshangarg/zulip,Galexrt/zulip,amanharitsh123/zulip,rishig/zulip,punchagan/zulip,jackrzhang/zulip,brainwane/zulip,amanharitsh123/zulip,showell/zulip,zulip/zulip,Galexrt/zulip,rht/zulip,mahim97/zulip,andersk/zulip,kou/zulip,zulip/zulip,jrowan/zulip,vaidap/zulip,timabbott/zulip,andersk/zulip,mahim97/zulip,jrowan/zulip,showell/zulip,punchagan/zulip,showell/zulip,eeshangarg/zulip,dhcrzf/zulip,hackerkid/zulip,kou/zulip,synicalsyntax/zulip,kou/zulip,andersk/zulip,amanharitsh123/zulip,tommyip/zulip,timabbott/zulip,rishig/zulip,Galexrt/zulip,eeshangarg/zulip,verma-varsha/zulip,amanharitsh123/zulip,vaidap/zulip,vabs22/zulip,brainwane/zulip,brockwhittaker/zulip,timabbott/zulip,vabs22/zulip,synicalsyntax/zulip,rishig/zulip,hackerkid/zulip,andersk/zulip,kou/zulip,Galexrt/zulip,eeshangarg/zulip,shubhamdhama/zulip,punchagan/zulip,zulip/zulip,tommyip/zulip,brainwane/zulip,rht/zulip,showell/zulip,brockwhittaker/zulip,Galexrt/zulip,tommyip/zulip,timabbott/zulip,verma-varsha/zulip,vaidap/zulip,jackrzhang/zulip,brainwane/zulip,dhcrzf/zulip,jackrzhang/zulip,brockwhittaker/zulip,tommyip/zulip,rishig/zulip,dhcrzf/zulip,synicalsyntax/zulip,jrowan/zulip,showell/zulip,vabs22/zulip,jrowan/zulip,jackrzhang/zulip,synicalsyntax/zulip,verma-varsha/zulip,Galexrt/zulip,rishig/zulip,dhcrzf/zulip,Galexrt/zulip,vabs22/zulip,brockwhittaker/zulip,rishig/zulip,timabbott/zulip,tommyip/zulip,brainwane/zulip,tommyip/zulip,mahim97/zulip,zulip/zulip,andersk/zulip,andersk/zulip,shubhamdhama/zulip,punchagan/zulip,zulip/zulip,vabs22/zulip,hackerkid/zulip,dhcrzf/zulip,verma-varsha/zulip,rht/zulip,synicalsyntax/zulip,showell/zulip,shubhamdhama/zulip,verma-varsha/zulip,timabbott/zulip,zulip/zulip,vaidap/zulip,verma-varsha/zulip,shubhamdhama/zulip,hackerkid/zulip,kou/zulip,shubhamdhama/zulip,mahim97/zulip,rishig/zulip,hackerkid/zulip,rht/zulip,zulip/zulip,brainwane/zulip,brainwane/zulip,tommyip/zulip,vaidap/zulip,kou/zulip,jackrzhang/zulip,kou/zulip,shubhamdhama/zulip,eeshangarg/zulip,punchagan/zulip,jrowan/zulip,hackerkid/zulip,eeshangarg/zulip,amanharitsh123/zulip,mahim97/zulip,punchagan/zulip,jackrzhang/zulip,brockwhittaker/zulip,synicalsyntax/zulip,andersk/zulip,showell/zulip,jrowan/zulip,rht/zulip,jackrzhang/zulip,shubhamdhama/zulip,rht/zulip