Fix bug where icon remains invisible after returning home.

- The bug is caused by cancelling of the RectFSpringAnim before the
  StaggeredWorkspaceAnim has started.
- Instead of having logic in StaggeredWorkspaceAnim control the visibility
  of the icon, we instead maintain all the visibility within the
  FloatingIconView class itself.

Bug: 142120338
Change-Id: I082291ca9b288f57701cc00d61a9b3a84da8b084