Revert "Prevent non-admin users from deleting system apps."

This reverts commit 6c870e157994519094e9e50ddf93e57a26779e22.

Reason for revert: Regression, DELETE_SYSTEM_APP flag no longer works

Change-Id: Id3eb9e08a5404e88c39235d0d47337ed41bc6139
Merged-In: I4e959e296cca9bbdfc8fccc5e5e0e654ca524165
1 file changed