Merge "Use the splash screen background color as the fallback background color" into sc-dev am: 3616f29f83 am: 93fceb43c1

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14881306

Change-Id: Id609015dab5ff26f9a9c02fe2e6c07253dad8e69