Fix Notice on mod_menu (#10452)

* Fix notice on mod_menu

Notice: Only variables should be passed by reference in
C:\wamp\www\develop\administrator\modules\mod_menu\tmpl\default_enabled.php
on line 23

* fix codestyle

* second try

administrator/modules/mod_menu/menu.php

@@ -49,12 +49,12 @@ public function __construct()
 	/**
 	 * Method to add a child
 	 *
-	 * @param   JMenuNode  &$node       The node to process
+	 * @param   JMenuNode  $node        The node to process
 	 * @param   boolean    $setCurrent  True to set as current working node
 	 *
 	 * @return  void
 	 */
-	public function addChild(JMenuNode &$node, $setCurrent = false)
+	public function addChild(JMenuNode $node, $setCurrent = false)
 	{
 		$this->_current->addChild($node);