Merge "Overview - don't update task overlay on thumbnail update." into sc-dev am: 02ca6c14dd am: 15166bb0c2 am: 2e7d55fb1a

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

Change-Id: Ic02597638baf1de45aa23bbce6b4f2adf6629cf0