hotkeys: Fix ESC removing message feed focus in Firefox.
hotkeys: Fix ESC removing message feed focus in Firefox.

We correct a bug on Firefox where using the ESC key to close an edit
box that was opened by the left arrow key caused the message feed to
lose focus, making it difficult to navigate the message feed by
keyboard afterwards.

We fix this bug by changing the function that handles the ESC key
during an edit to pass the correct object to the message_edit.end
function.

Fixes #7072.

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