Fix shuffle on IterableDataset that disables batching in case any functions were mapped
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Made a very minor change to fix the issue#2716. Added the missing argument in the constructor call.

As discussed in the bug report, the change is made to prevent the `shuffle` method call from resetting the value of `batched` attribute in `MappedExamplesIterable`

Fix #2716.
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{'url': 'https://api.github.com/repos/huggingface/datasets/pulls/2717', 'html_url': 'https://github.com/huggingface/datasets/pull/2717', 'diff_url': 'https://github.com/huggingface/datasets/pull/2717.diff', 'patch_url': 'https://github.com/huggingface/datasets/pull/2717.patch', 'merged_at': '2021-07-26T16:30:05Z'}