Allow permission renouncement without RENOUNCE permission in test mode.

This allows permission renouncement to be recognised when the caller
does not have the RENOUNCE_PERMISSIONS permission, when in test mode.

Without this, renouncement cannot be tested because a test apk cannot
be given RENOUNCE_PERMISSIONS, and the shell (whose permissions can be
adopted) does not have BLUETOOTH_SCAN.

Bug: 183625242
Test: atest NearbyDevicesRenouncePermissionTest
Change-Id: If4a7235b9141b9279016671b8745b8ba5afd8f41