fix callback use client_id (#993)

src/backend/langflow/api/v1/callback.py

@@ -123,8 +123,8 @@ class AsyncStreamingLLMCallbackHandler(AsyncCallbackHandler):
 class StreamingLLMCallbackHandler(BaseCallbackHandler):
     """Callback handler for streaming LLM responses."""
 
-    def __init__(self, websocket):
-        self.websocket = websocket
+    def __init__(self, client_id: str):
+        self.client_id = client_id
 
     def on_llm_new_token(self, token: str, **kwargs: Any) -> None:
         resp = ChatResponse(message=token, type="stream", intermediate_steps="")