add support to another wav mimetype
add support to another wav mimetype

```bash
$ file --mime-type file.wav
file.wav: audio/x-wav
$ file file.wav
file.wav: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, stereo 44100 Hz
```


note: aac had a `'LEFT-TO-RIGHT MARK' (U+200E)` that I removed too
Chocobozzz/PeerTube,Chocobozzz/PeerTube,Chocobozzz/PeerTube,Chocobozzz/PeerTube