style: 修改文件上传多选框默认文案

src/views/Tracking/src/components/TrackingDetail/src/components/UploadFilesDialog.vue

@@ -141,7 +141,7 @@ const uploadFileParams = computed(() => ({
   >
     <div class="upload-template">
       <div class="label">File Type</div>
-      <el-select v-model="fileType" placeholder="string">
+      <el-select v-model="fileType" placeholder="fileType">
         <el-option
           v-for="item in fileTypeList"
           :key="item.file_type"