Update chatllm.py

fix bug：open_key changed

chatllm.py

@@ -76,7 +76,7 @@ class ChatLLM(LLM):
             OPENAI_URL = "https://api.openai.com/v1/chat/completions"
             
             headers = {
-                "Authorization": f"Bearer {api_key}",
+                "Authorization": f"Bearer {OPENAI_API_KEY}",
                 "Content-Type": "application/json"
             }