hotkeys: Clear compose box warnings with escape key.
hotkeys: Clear compose box warnings with escape key.

Fixes #7531.

jackrzhang/zulip,mahim97/zulip,zulip/zulip,rishig/zulip,kou/zulip,rht/zulip,dhcrzf/zulip,jackrzhang/zulip,zulip/zulip,punchagan/zulip,showell/zulip,dhcrzf/zulip,rishig/zulip,rishig/zulip,brainwane/zulip,jackrzhang/zulip,dhcrzf/zulip,hackerkid/zulip,tommyip/zulip,brainwane/zulip,hackerkid/zulip,synicalsyntax/zulip,showell/zulip,timabbott/zulip,synicalsyntax/zulip,showell/zulip,brainwane/zulip,hackerkid/zulip,timabbott/zulip,synicalsyntax/zulip,kou/zulip,showell/zulip,brainwane/zulip,andersk/zulip,shubhamdhama/zulip,andersk/zulip,showell/zulip,kou/zulip,shubhamdhama/zulip,jackrzhang/zulip,rht/zulip,shubhamdhama/zulip,shubhamdhama/zulip,shubhamdhama/zulip,zulip/zulip,hackerkid/zulip,hackerkid/zulip,zulip/zulip,rht/zulip,eeshangarg/zulip,punchagan/zulip,mahim97/zulip,showell/zulip,kou/zulip,punchagan/zulip,andersk/zulip,rht/zulip,brainwane/zulip,andersk/zulip,mahim97/zulip,rht/zulip,zulip/zulip,eeshangarg/zulip,dhcrzf/zulip,tommyip/zulip,timabbott/zulip,mahim97/zulip,dhcrzf/zulip,zulip/zulip,synicalsyntax/zulip,eeshangarg/zulip,dhcrzf/zulip,punchagan/zulip,tommyip/zulip,zulip/zulip,synicalsyntax/zulip,rishig/zulip,showell/zulip,eeshangarg/zulip,timabbott/zulip,synicalsyntax/zulip,punchagan/zulip,mahim97/zulip,rishig/zulip,jackrzhang/zulip,tommyip/zulip,kou/zulip,timabbott/zulip,rishig/zulip,shubhamdhama/zulip,punchagan/zulip,kou/zulip,jackrzhang/zulip,kou/zulip,timabbott/zulip,synicalsyntax/zulip,eeshangarg/zulip,andersk/zulip,brainwane/zulip,tommyip/zulip,rht/zulip,eeshangarg/zulip,tommyip/zulip,hackerkid/zulip,andersk/zulip,rishig/zulip,punchagan/zulip,hackerkid/zulip,eeshangarg/zulip,brainwane/zulip,shubhamdhama/zulip,tommyip/zulip,jackrzhang/zulip,mahim97/zulip,rht/zulip,dhcrzf/zulip,timabbott/zulip,andersk/zulip