update yudao-ui-admin/src/components/VideoUpload/index.vue.

修复修改后再新增时的表单无法清除还原到未选择视频文件状态的问题

Signed-off-by: zbk <540064991@qq.com>

yudao-ui-admin/src/components/VideoUpload/index.vue

@@ -92,6 +92,9 @@ export default {
         if (val) {
           this.videoUrl = val;
           this.uploadFlag = true;
+        } else {
+          this.videoUrl = null;
+          this.uploadFlag = null;
         }
       },
       deep: true,