text/textview: Remove redundant code related to emoji chooser
Code to grab focus when closing the chooser was added to fix #3112 (closed), but it seems the issue has been fixed elsewhere since. Since this code is now redundant, remove it.
Also reverts 1d1ef311, since it, as far as I can tell, tried to fix a selection issue caused by the explicit focus grab when closing the chooser. It no longer made any difference in my testing.