Prevent exfiltration of system files via avatar picker. am: f70e351d am: 05ea36dd

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/19745058



Change-Id: I8cc4562420648436abb478b686adb96c28d8163b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>