Fix issue with PiP menu activity disallowing touches

- On devices where the expanded bounds are the same as the collapsed
  bounds, there is no task stack animation and no subsequent animation
  end callback, which means that touch state is not reset. Skip
  disallowing touches in this state.
- Also fix race causing the PiP menu to ignore touches due to the pinned
  animation end callback happening before the menu is first shown.

Bug: 65168767
Test: Tap menu on Ryu, rotate, and try and drag the PiP before the menu
      times out

Change-Id: I0b264678aa3300fd4d4e9da5ef3d48a590232ae1