Don't update the PiP bounds when we aren't resizing the PiP

- When we go from a non-expanded menu (with just the close button) to a
  no-menu state, ignore the logic to readjust the PiP since it can
  introduce rounding errors.

Bug: 80500702
Test: Enter PiP on P3, then launch an app and ensure that it moves back to
      the bottom

Change-Id: Iad3f491ab08b575bdca57a127e8f7e6d35c0d443