Fix isExternalStorageSandboxed() bug.

It needs to use the same STOPSHIP logic for consistency with the
two other enforcement sites across the OS.

Bug: 129487770
Test: atest android.appsecurity.cts.ExternalStorageHostTest
Change-Id: I7a3fa836e0795912c264aae58a55472ffae3d8c3
1 file changed