Only mark queued transition as no-op if Shell-init

We have been marking some queued transitions as
mShouldNoopUponDequeue=true if they were coming in
while a display changing transition was collecting but hasn't started.
We were doing this because Shell wasn't aware of the new display state
yet.

This, however, does not apply to Core-initiated transitions, as they are
fully aware of the latest WM state; so this is just a Core <-> Shell
serialization issue.

Hence, we should limit the no-op-ing only to transitions directly
initiated by Shell through WindowOrganizerController.

Bug: 436919678
Flag: EXEMPT bugfix
Test: atest CtsWindowManagerDeviceDisplay:AppConfigurationTests
  #testTaskMoveToBackOrientation
Change-Id: I66ff1a11176c88327536e1b9d1b61be3af333890