修复未登录状态下购物车不能编辑的bug

Code Review By Rock Zhang

@@ -261,7 +261,7 @@ class IndexController extends AbstractAction
         $result = array();
 
         if ($this->isAjax()) {
-            $shoppingKey = $this->getSession('shoppingKey');
+            $shoppingKey = Helpers::getShoppingKeyByCookie();
             $uid = $this->getUid(true);
 
             $params = array();