Updates destination bounds upon rotation change

This would be a bug for any PiP-enabled application if the preferred
fullscreen is in a different screen rotation than in PiP mode.

Bug: 150360003
Test: atest PinnedStackTests
Test: manually enter/exit PiP w/ Play movies app
Change-Id: Ibb56d907b9968eaf90171315faa6181a7e72b146