Fix FloatingWidgetView post-animation fallback background handling am: e41034034f am: e25a5157b4 am: ba6e38b1cb

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14440781

Change-Id: I7d9ff2b4ede397f8317bc705d7ef716b13ee5b4f