Fix row-group size for imagefolder and audiofolder datasets
Close https://github.com/huggingface/datasets-server/issues/2646

I'll recompute the parquet-and-info jobs for the impacted datasets, otherwise their Viewer will still be slow or get TooBigContentError
Fix row-group size for imagefolder and audiofolder datasets: Close https://github.com/huggingface/datasets-server/issues/2646

I'll recompute the parquet-and-info jobs for the impacted datasets, otherwise their Viewer will still be slow or get TooBigContentError