Fix PiP being out of bounds when launched into forced orientation

- Ensure that we use the right bounds when calculating the post-rotation
  bounds (it should always be the target bounds)
- Ensure that we update the controller when the task stack bounds change

Bug: 35402420
Test: android.server.cts.ActivityManagerPinnedStackTests
Test: #testEnterPipToOtherOrientation
Change-Id: Ie0e3fc6a93b4eb6250c60584e80afb029b3c599a