[FIX] mail: make clicking on chat window's emoji button properly work

Before this commit, clicking on the button opened the emoji popover
then closed it immediately. This was because of a handler which said
that clicking on any part of the composer should focus the input
element. This is indeed required when the UI is blocked (thanks to
the `blockUI` function). Solution is to not force this focus when
clicking on any composer's button element.

To prevent breaking those two behaviors (blockUI focus and emoji), two
tests were implemented.

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