Merge "Correct the preview generation for App Widgets." into sc-dev am: 11ec51c48c am: 85e5dd1c5d

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14328126

Change-Id: I9110efb16ef7ab2a3974997b162df434258b3ae9