Update app.py

iam facing Openrouter api key issue , hence commenting paramete "max_tokens"

app.py

@@ -188,7 +188,7 @@ def chat_with_model(user_input, model, history):
         response = client.chat.completions.create(
             model=model,
             messages=messages,
-            max_tokens=1000,
+            # max_tokens=100,
             temperature=0.7
         )