Merge "Clear WidgetCell#mItem before recylcing a WidgetCell" into sc-v2-dev am: ac21df2246 am: 237a06a04d

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15242987

Change-Id: Iba0f448e242d8ae0ef0e33c925e6a94e2c22a9a5