Finish fixed rotation after recents moved to top

While the task transition is running, its activity is the animation
source. If recents animation is triggered and finished before the
transition is done, the animation source will be notified that the
transition is finished. At this timing, the rotated activity is still
the top activity. Since it is moving to back, the display orientation
is unnecessary to be updated for the intermediate state. That avoids
flickering by not committing visibility due to configuration change.

Fixes: 160239226
Test: atest RecentsAnimationControllerTest# \
            testKeepFixedRotationWhenMovingRecentsToTop
Change-Id: I5c5c12338b9bc0cd8a99655a843a33d8729f8892