オプション引数が必須引数より先に来ているコードを修正

src/Eccube/Controller/Admin/Setting/Shop/MailController.php

@@ -53,7 +53,7 @@ public function __construct(MailTemplateRepository $mailTemplateRepository)
      * @Route("/%eccube_admin_route%/setting/shop/mail/{id}", requirements={"id" = "\d+"}, name="admin_setting_shop_mail_edit", methods={"GET", "POST"})
      * @Template("@admin/Setting/Shop/mail.twig")
      */
-    public function index(Request $request, MailTemplate $Mail = null, Environment $twig, CacheUtil $cacheUtil)
+    public function index(Request $request, Environment $twig, CacheUtil $cacheUtil, MailTemplate $Mail = null)
     {
         $builder = $this->formFactory
             ->createBuilder(MailType::class, $Mail);