More minor menu changes

- Don't wait for double tap timeout when clicking to unstash (you can't
  double tap while stashed to expand)
- Hide the menu when stashing so that it doesn't show again when
  unstashed
- Only log unstash if previously stashed

Bug: 183756396
Test: Tap to show unstashed pip/stash with menu showing
Change-Id: I693b67d38f32d28636ff6b5d0aaf096af78b825b