Update app.py: fixing a bug

app.py

@@ -41,7 +41,10 @@ final_answer = FinalAnswerTool()
 # If the agent does not answer, the model is overloaded, please use another model or the following Hugging Face Endpoint that also contains qwen2.5 coder:
 #model_id='HuggingFaceTB/SmolLM2-1.7B' 
 # pip install transformers
+device="cpu"
 model_id = "HuggingFaceTB/SmolLM2-1.7B-Instruct"
+model = AutoModelForCausalLM.from_pretrained(model_id).to(device)
+