Update app.py: debugging - model qwen change to 7b

app.py

@@ -87,7 +87,7 @@ final_answer = FinalAnswerTool()
 model = HfApiModel(
     max_tokens=2096,
     temperature=0.5,
-    model_id='Qwen/Qwen2.5-Coder-32B-Instruct',
+    model_id='Qwen/Qwen2.5-Coder-7B-Instruct',
     custom_role_conversions=None,
 )