Fixes path in librispeech.py
This PR fixes the Not a single example present in the PCollection! assertion error while running tfds build librispeech.
The fix came from https://github.com/tensorflow/datasets/pull/2181/files.
Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).
For more information, open the CLA check for this pull request.
A gentle ping on this PR. Currently tfds build librispeech does not work.
Thank you for your contribution!
I'm closing this PR because it was fixed: https://github.com/tensorflow/datasets/blob/852d219028f38cec429d91ba9479ca0d3f60ba7d/tensorflow_datasets/datasets/librispeech/librispeech_dataset_builder.py#L147