pref: remove redundant init_messages usage in llm.py

fix #149

Author: ulleo

backend/apps/chat/task/llm.py

@@ -148,8 +148,6 @@ def __init__(self, current_user: CurrentUser, chat_question: ChatQuestion,
         else:
             self.chat_question.error_msg = ''
 
-        self.init_messages()
-
     @classmethod
     async def create(cls, *args, **kwargs):
         config: LLMConfig = await get_default_config()