Dismiss IME when floating window is dismissed

Previously the IME would be stuck on screen if the
floating window was dismissed while it was showing.

Original id from PA gerrit -> Change-Id:
I8ca61b07ed89bae85eabd8db23f87b6f1f0b179f
Signed-off-by: Evan Anderson <evan@thelinuxman.us>

Change-Id: If38e65f61ba309d22306bf4b37c3c55630c006ed