Only say that superuser is disabled when the ACL isnt empty.

bin/server.dart

@@ -54,9 +54,8 @@ void main() async {
     print("Disabling super user...");
     settings.superuser =
         User.make("_disabled", "%%%disabled%%%", UserLevel.None);
-  }
-
     print("Super User is disabled because there are users registered.");
+  }
 
   print("Finished installing needed DLLs");