Fix bubble reordering issue

This change ensures that the deferred reordering action always runs at the end of the gesture.

We started deferring reordering actions to avoid breaking drag gestures. But tapping on the selected bubble to collapse the stack is considered a gesture as well.
Previously the reorder action did not get run in that case, because the specific touch listener that runs it ignores touch events during animations.

Fixes: 323310200
Test: Manual
      - Create 2 bubbles
      - Expand stack
      - Tap on second bubble
      - Tap on the second bubble again to collapse the stack
      - Observe that the second bubble is showing in the collapsed state
Test: Manual -- also checked that dragging isn't broken when a new bubble is added
Change-Id: I4bfcff7e23e7ee3f4304a28cac4a9ba6e10cee16