dataset_utils: add mask_out_tokens to train_on_responses_only (fixes unslothai/unsloth#6695)#852

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unslothai:mainunslothai/unsloth-zoo:mainfrom

pjordanandrsn:fix/6695-mask-out-tokenspjordanandrsn/unsloth-zoo:fix/6695-mask-out-tokensCopy head branch name to clipboard