Merge "Always return the system default wallpaper with openDefaultWallpaper" into udc-dev am: 6eb6a5ca am: 6bc4ac27

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22480085



Change-Id: I7d8c803c4d75745e6a8a52759014c10e318548c5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>