Suppress transition when mCancelWithDeferredScreenshot as true.

Sometimes, back transition is being suppressed when pressing back key to back
previous task.
It seems that a home transition is active at this point, which suppresses the
activity animation.

If home transition is animate during RecentAnimation invoked, which will suppress
activity animation in AppWindowToken#shouldAnimation, this does not make sense.

Add mCancelWithDeferredScreenshot check to only suppress animation when canceling
recents animation with screenshot case to fix above case.

Bug: 129934735
Test: manual as below steps:
1. Have 2 button navigation enabled.
2. Go to Google News
3. Open article
4. Press back
5. Expect the back transition should not be suppressed.
Test: atest RecentsAnimationControllerTest

Change-Id: Id59b87fb7438b2bc9f4bf33e3009e726fce82562