emoji-picker: Update scrollbar after each search filter.
emoji-picker: Update scrollbar after each search filter.

Fixes #4825.

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