Fix zipped audio extension in streaming
The audio file extension was not inferred correctly when we stream the first rows.

Indeed in some cases the audio file path can be

```
zip://audio.wav::https://foo.bar/data.zip
```

fix https://huggingface.co/datasets/ccmusic-database/acapella_eval/discussions/3
Fix zipped audio extension in streaming: The audio file extension was not inferred correctly when we stream the first rows.

Indeed in some cases the audio file path can be

```
zip://audio.wav::https://foo.bar/data.zip
```

fix https://huggingface.co/datasets/ccmusic-database/acapella_eval/discussions/3