emoji_picker.js: Fix popover icon that persists after exit.
emoji_picker.js: Fix popover icon that persists after exit.

Another manifestation of #4329, as this bug
also applied to the emoji popover.

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