Ensure that we hide the menu without resizing when expanding.

- This should be done when expanding/dismissing from the menu activity,
  otherwise the menu state change can cause a stack-resize animation that
  clobbers the expand or dismiss animation.

Bug: 37650245
Test: Launch Duo in PIP, end call from notification tray
Change-Id: Ie880715ae7be28a4fe2dd0d294e369b62e776c35