Hide non-system overlay window on ActivityPicker am: c4121c15e4 am: 21a0db9882

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/17628100

Change-Id: Id6820351a67c2b2924a9a6ee3a06731519510ff7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>