fix(接口测试): 修复接口的响应内容上传文件不显示的缺陷

--bug=1037843 --user=王孝刚 【接口定义】-响应内容-响应体设置为 binary，保存后不展示文件
https://www.tapd.cn/55049933/s/1484550

frontend/src/views/api-test/components/requestComposition/response/edit.vue

@@ -363,15 +363,9 @@
     }
   });
 
-  async function handleFileChange(files: MsFileItem[]) {
-    if (!props.uploadTempFileApi) return;
-    if (files.length === 0) {
-      activeResponse.value.binaryBody.file = undefined;
-      emit('change');
-      return;
-    }
+  async function handleFileChange() {
     try {
-      if (fileList.value[0]?.local && fileList.value[0].file) {
+      if (fileList.value[0]?.local && fileList.value[0].file && props.uploadTempFileApi) {
         appStore.showLoading();
         const res = await props.uploadTempFileApi(fileList.value[0].file);
         activeResponse.value.body.binaryBody.file = {