Merge "Conform the logic to decide wallpaper darkness" into udc-dev am: 4f7f216c1f am: 5113509114

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/23618530

Change-Id: Idcdc4e6ff799abe3f1a8dbe08b23f9cfb469fb71
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>