Merge "Treat setup wizard default home as null." into tm-qpr-dev am: 5248b02080

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/21690746

Change-Id: I51f0ca59c02cba6b44c38971be924dd9b0bb28f7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>