When closing filter dialog via menu / shortcut, also reset them

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Better menu entry for filter

This is no longer just a tag filter. Also, since we use this entry (and
its shortcut) like a toggle we should mark the menu entry accordingly.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>