Fix TV privacy icon transition getting stuck

If `collapseChips` is called when all chips are already collapsed,
`beginDelayedTransition` would not see any UI updates and no transition
would start. If a transition was already in progress, that transition
would be paused, which could lead to the privacy items visually stuck on
screen during the fade out transition.

This change first checks whether a UI change needs to be made (whether
there are any chips to collapse) before calling
`beginDelayedTransition` to avoid pausing any currently ongoing
transition.

Bug: 288546065
Test: manual, with increased animator_duration_scale
Change-Id: Ic4d2d0dff143d4966f8fdc29fc1e4a66e6604712