Fix bugs with quickstep springs.

* Listeners weren't getting called properly. We add one listener to the
SpringbjectAnimator and then use that to dispatch to the other listeners.

* We fast finish on both double swipe cases to prevent the shelf from
  ending in an invalid state. This causes a visual jump but this can be
  addressed in follow up CL.

Bug: 111698021
Change-Id: Ifeb55da9dd253d062122a8e1577f94044f688641