[automerger skipped] Fix more kotlin nullable errors in Launcher3 am: 5a7cfbdaf2 -s ours am: db2121affd -s ours

am skip reason: Merged-In I158db4f57d46606d7152a438d68e2b9f4c0014d9 with SHA-1 4aef83aa32 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/24694222

Change-Id: Iae80498e06569542125a876f15de2d839415188c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>