fix: close create model dialog cancel loading

--bug=1050889 --user=刘瑞斌 【模型管理】上一个模型的添加中状态会影响后面添加的模型 https://www.tapd.cn/57709429/s/1637704

ui/src/views/template/component/CreateModelDialog.vue

@@ -353,6 +353,7 @@ const close = () => {
   credential_form_data.value = {}
   model_form_field.value = []
   base_model_list.value = []
+  loading.value = false
   dialogVisible.value = false
 }
 const submit = () => {