overlays: Fix compose box closing when clicking on overlays.
overlays: Fix compose box closing when clicking on overlays.

This was a bug introduced by a recent refactoring to rename .modal to
.overlay for consistency.

Fixes #5886.

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