bug#68512: Qutebrowser 3, no sound from pipewire-only system

[chris]

Sergey, your configuration file is working and audio is heard from qutebrowser 
on this system.

Internet searches surfaced commands like these,
 `pw-cli`
 `strace -e connect pw-dump >/dev/null`

Error messages were seen relating to socket files not found,
 `$XDG_RUNTIME_DIR/pipewire-0`
 `$XDG_RUNTIME_DIR/pipewire-0-manager`

Various things attempted, but the socket files missing every time sway started

Finally, tried removing the pipewire-starting parts of the sway config
```
# exec_always killall -wqr "(pipewire|wireplumber)" \
#   || sleep 1 && ((pipewire &); sleep 2 && (wireplumber &))
```

Then separately started pipewire and wireplumber "manually" from the shell. The 
socket files were created and when qutebrowser sound could be heard.

Thank you Sergey,

Chris