In case you forget the superuser password, here's how to reset it without losing all of your photos:
1. On your device, go to the home screen.
2. Connect the device to iTunes and upload a file named "resetpassword" to ShutterSnitch using the Apps > File Sharing feature.
3. On your device, open ShutterSnitch and you'll be asked to put in a new password.
The "resetpassword" file can just be a clear textfile saved from, for example, TextEdit or Notepad.