Fix file download path.

app/api/meta_data/routes.py

@@ -393,7 +393,7 @@ def download_file():
         if not object_name:
             return jsonify(failed("文件路径不能为空"))
             
-        # URL解码，处理特殊字符
+        # URL解码，处理特殊字符.
         import urllib.parse
         object_name = urllib.parse.unquote(object_name)