One Little Typo in experiments.slipt_mnist.naive

In experiments.slipt_mnist.naive module, the `'task_incremental': False` in line 18 is not corresponding to the `return_task_id=args.task_incremental` in line 24, which will cause `AttributeError: 'types.SimpleNamespace' object has no attribute 'task_incremental'` on my computer. I think it's a typo in line 18, but it has been here for a quite long time.
I am using Python 3.9, and I suppose it can be fixed in one second, literally.