Add Flag to disable wallpaper restorer (1/2) am: cd4f673ab4 am: ad0bc40f39

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/23604162

Change-Id: Ib1999ef03fce537348d67151df33dd52320802aa
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>