[Bug] kss formatter doesn't set the root_path attribute

[github40912]

Describe the bug

https://github.com/coqui-ai/TTS/blob/v0.9.0/TTS/tts/datasets/formatters.py#L602

To Reproduce

---

KeyError                                  Traceback (most recent call last)
/tmp/ipykernel_23/1931759875.py in <module>
     72     eval_split=True,
     73     eval_split_max_size=config.eval_split_max_size,
---> 74     eval_split_size=config.eval_split_size,
     75 )

/opt/conda/lib/python3.7/site-packages/TTS/tts/datasets/__init__.py in load_tts_samples(datasets, eval_split, formatter, eval_split_max_size, eval_split_size)
    121         assert len(meta_data_train) > 0, f" [!] No training samples found in {root_path}/{meta_file_train}"
    122 
--> 123         meta_data_train = add_extra_keys(meta_data_train, language, dataset_name)
    124 
    125         print(f" | > Found {len(meta_data_train)} files in {Path(root_path).resolve()}")

/opt/conda/lib/python3.7/site-packages/TTS/tts/datasets/__init__.py in add_extra_keys(metadata, language, dataset_name)
     62         item["language"] = language
     63         # add unique audio name
---> 64         relfilepath = os.path.splitext(os.path.relpath(item["audio_file"], item["root_path"]))[0]
     65         audio_unique_name = f"{dataset_name}#{relfilepath}"
     66         item["audio_unique_name"] = audio_unique_name

KeyError: 'root_path'

Expected behavior

No response

Logs

No response

Environment

v0.9.0

Additional context

No response

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