[automerger skipped] Fix kotlin nullable errors in Launcher3 am: e892df24ca -s ours am: 79c7f28993 -s ours am: a42a24fb97 -s ours am: 81ebeb0a3b -s ours

am skip reason: Merged-In I26edfec35dca14abe90b08e3c74de0446eda95d2 with SHA-1 2608381792 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/24723831

Change-Id: Ib37a3a1a097314c8e9deb7b7215dbb67476070e4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>