Merge "Refresh thumbnail splash when task icon changes." into tm-qpr-dev am: f5f3a809

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/21319101



Change-Id: I34d77503f27fa5d12e1f1db689e499880105ccdf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>