Fix issue with swipe up canceling recents animation.

- Only cancel the animation if handling the button, in that case,
  FLAG_CANCELED is not set (we were previously also only falling into this
  block to cancel the animatino in KeyButtonView)

Bug: 78660363
Test: Swipe up over back button, ensure we still enter quickstep
Change-Id: I038adcbd6c4b4ffda28dd86151c855eed04f5e0d