vhost-device-sound: update format when pipewire has been released

[MatiasVara]

@nicholasdezai found that the format is not correctly setup in line:

vhost-device/vhost-device-sound/src/audio_backends/pipewire.rs

Line 322 in 9f8ba88

audio_info.set_format(AudioFormat::S16LE);

This shall be fixed in next pw release that includes https://gitlab.freedesktop.org/pipewire/pipewire-rs/-/merge_requests/226/diffs. The fix would look like:

audio_info.set_format(AudioFormat(info.format));