remove chat_glm.ChatMessage from code

app.py

@@ -7,7 +7,7 @@ import gradio as gr
 
 class myChatMessage(chatglm_cpp.ChatMessage):
     def __deepcopy__(self, memo):
-        return chatglm_cpp.ChatMessage(self.role, self.content)
+        return myChatMessage(self.role, self.content)
     def __getstate__(self):
         """Used for serializing instances"""
         return (self.role, self.content)