Merge "Overview - don't update task overlay on thumbnail update." into sc-dev am: 02ca6c14dd am: 15166bb0c2

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14537691

Change-Id: If32719395ab87e7b8c43f878c224b93f2f509bb9