Merge "Add automirroring to kids mode back button." into tm-qpr-dev am: aaa932d78c am: 6bf7c6b816 am: 6fcf80fa9c

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/22099529

Change-Id: Ia16d0f903002b2e5983587804c6f393b25dc79c6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>