Merge "[tp] Changes GlobalScope to CoroutineScope(Dispatchers.Main) (2/2)." into udc-dev am: c78b9ad38a

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/22894548

Change-Id: I8b812d2910f38c2350deb40e745971582a59a60d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>