add missing parameter for Backupninja::Rdiff type

manifests/rdiff.pp

@@ -27,6 +27,8 @@ define backupninja::rdiff($order = 90,
                            $keep = 30,
                            $sshoptions = false,
                            $options = false,
+                           $ssh_dir = false,
+                           $authorized_keys_file = false,
                            $installuser = true,
                            $installkey = true,
                            $backuptag = false