[automerger skipped] Fix kotlin nullable errors in Launcher3 am: 70ca32bca2 -s ours am: f65d8e122a -s ours am: 24803b44be -s ours

am skip reason: Merged-In I4525d0fa83a1db9cc5cff90f340fc3f863537c01 with SHA-1 4cc251e6c1 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/24721675

Change-Id: I764491ddde5dcbb47ed16a5b521b63376cbac081
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>