Handle onFlingFinished onRecentsAnimationStart

If the onRecentsAnimationStart callback runs after the user lifts their finger and onFlingFinished runs, then onFlingFinished never has another chance to run, leaving the user trapped in a state where the launcher is not started and the AllSetActivity is still present but invisible. Reverted to allow onFlingFinished to run onRecentsAnimationStart to handle this edge case.

Flag: not needed
Fixes: 285194839
Test: Ran AllSetActivty with a delay in onRecentsAnimationStart
Change-Id: I33ce5c1d4955b34d4b77d3b740dc599621bd4ed1
Merged-In: I33ce5c1d4955b34d4b77d3b740dc599621bd4ed1