Reduce flickering when exiting PiP to fullscreen

The start transaction should use the operation from the first frame
of animation. Otherwise it doesn't include the operations made by
source hint or rotation.

Note that the change in PipTaskOrganizer doesn't affect anything.
Just make sure potential overrides of getExitDestinationBounds
take effect, e.g. other form factor with special implementation.

Bug: 285086073
Test: Resize PiP to max and expand PiP to fullscreen.

Change-Id: Iba87494f7ce76a808e1b8c88053cd9d5b5b1a5d6