Fix bug where icon is no present during app close animation.

* WindowTransformSwipeHandler closes all AbstractFloatingViews, including
  ListenerView, which results in FloatingIconView getting removed.
* In IconLoadResult.onIconLoaded, we remove the check for isIconLoaded since
  its not needed. This was also causing a race condition since isIconLoaded
  is not set to true until after we tell onIconLoaded to run.
* In BaseDragLayer, we have a delay before checking if the view is open and
  then closing the floating view if true. This caused issues since we reycle
  the view. Now we check if the view is open before running the delay to call
  close.

Bug: 136044361
Change-Id: I7442a589a62c3cdf90b70d146e0ecf3e4300ddf7
(cherry picked from commit 826cdcd3)
(cherry picked from commit bc278264)