Update app.py

app.py

@@ -132,7 +132,7 @@ def convert_to_onnx(task_id, model_name, directory):
     update_task(task_id, f"ONNX output path: {onnx_path}")
     
     original_dir = os.getcwd()
-    os.chdir('/root/piper/src/python')
+    os.chdir('/home/app/piper/src/python')
     update_task(task_id, f"Changed working directory to: {os.getcwd()}")
     
     command = [