Fix generate config validation error on inference unit tests

[mrwyattii]

huggingface/transformers#25381 Added validation to generate config in transformers. Updating our inference kwargs to avoid validation errors:

ValueError: `do_sample` is set to `False`. However, temperature is set to 0.9 -- this flag is only used in sample-based generation modes. Set `do_sample=True` or unset temperature to continue.