Check if all apps are translucent when finishing recents animation.

If true, then launcher will be finished at the end of the animation.
This fixes the issue where taskbar will stash in overview because
we assumed the app was fully opaque.

Bug: 354627538
Test: open app, go to overview, tap icon, pause app, note no issue
Flag: EXEMPT bugfix
Change-Id: Id51e0d9f63c9615127e27455f7edf171381c2011