fix(System/menu): 新建 FormModal 显示为编辑

src/views/system/menu/MenuFormModal.vue

@@ -18,7 +18,7 @@ const [registerForm, { setFieldsValue, validate }] = useForm({
   showActionButtonGroup: false,
 })
 
-const isUpdate = ref(true)
+const isUpdate = ref(false)
 const [registerModal, { setModalProps, closeModal }] = useModalInner((data: MenuItem) => {
   isUpdate.value = true
   setFieldsValue({