Ensure Gallery always shows as system fixed

previously, it would show as "limited access" if permissions were denied

Bug: 418085016
Bug: 315320090
Test: manual
Flag: EXEMPT security fix
Relnote: N/A
LOW_COVERAGE_REASON=b/315320090
(cherry picked from commit e102e2df90ad7cd1a08ac8423308b21d0c48d9d0)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:b40fd90c047daeaf67cd97dafc3b42ca926ea0fd)
Merged-In: Ibb09b8165bbb86d1cb1da93e4b71524528226596
Change-Id: Ibb09b8165bbb86d1cb1da93e4b71524528226596