Don't recreate the launcher animation controller if gesture ended

This can happen if we get onApplyWindowInsets() after onGestureEnded().
In that case, we can get into some bad states because the running
animation is overwritten and thus can't be canceled.

Bug: 134096917
Bug: 133806285
Change-Id: Ic517d68a46a4446ca382445df1ba62c26e8243ad