CPAL should skip the PipeWire backend when PulseAudio and PipeWire are both running on the system and conflicting

See: https://github.com/marin-m/SongRec/issues/265 The PipeWire backend will produce a "no node available" error when this issue happens with the corresponding defective setup I think that for better user experience we should switch to trying the PulseAudio or ALSA backend depending on what is enabled, rather than displaying this error