Update webui.py

fix flake8

webui.py

@@ -1,4 +1,4 @@
-# Copyright (c) 2024 Alibaba Inc (authors: Xiang Lyu,Liu Yue)
+# Copyright (c) 2024 Alibaba Inc (authors: Xiang Lyu, Liu Yue)
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.