Reset NSSL translationY after a transision gets cancelled

We update the translationY of the NSSL upon multiple transitions. If the
Occluded -> LockScreen transition is cancelled, there is no other
transition that is taking over. It causes the NSSL to get stuck with some negative translateY value. This caused the Notifications and the NotificationShelf to be shifted slightly upwards.

This fix resets the translation to 0 if the transition was interrupted
and not completed successfully.

Fixes: 273591201
Test: atest OccludedToLockscreenTransitionViewModelTest
Change-Id: If0c162a7f1b8a2cf3d261692f5ce333331c36a7b