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

[chris]

Hello,

The latest qutebrowser v3 from this pipewire-only system has no sound. Related 
messages from the shell process pasted below include CJK characters which 
debbugs renders as "??", all CJK messages translate as "file or directory not 
found"
```
ALSA lib pcm_dmix.c:1075:(snd_pcm_dmix_open) unable to open slave
[3003:3003:0116/083803.232761:ERROR:alsa_util.cc(204)] PcmOpen: 
default,そのようなファイルやディレクトリはありません
ALSA lib pcm_dmix.c:1075:(snd_pcm_dmix_open) unable to open slave
[3003:3003:0116/083803.233758:ERROR:alsa_util.cc(204)] PcmOpen: 
plug:default,そのようなファイルやディレクトリはありません
ALSA lib pcm_dmix.c:1075:(snd_pcm_dmix_open) unable to open slave
[3003:3003:0116/083808.743619:ERROR:alsa_util.cc(204)] PcmOpen: 
default,そのようなファイルやディレクトリはありません
ALSA lib pcm_dmix.c:1075:(snd_pcm_dmix_open) unable to open slave
[3003:3003:0116/083808.744661:ERROR:alsa_util.cc(204)] PcmOpen: 
plug:default,そのようなファイルやディレクトリはありません
```

About a year ago, user @iyzsong enabled pipewire support at qutebrowser v2 for 
me and sound has been good here until today when qutebrowser v3 was installed.  
iirc, a flag was enabled in qutebrowser or one of its dependencies.

Related: https://issues.guix.gnu.org/68483, https://issues.guix.gnu.org/67289