Some audio hardware reports output jacks as "Line Out" rather than
"Headphone" or generic analog outputs. Without an explicit "Line Out"
element in the SPA configuration, these ports may be ignored or
misidentified, leading to missing output options in desktop settings.
This change adds "Line Out" as a recognized element in both the
headphones and lineout SPA configuration files, improving compatibility
with a wider range of audio devices.
According to the alsa-info.txt in the pipewire issues of #747 and #1206,
the Front Playback Volume is shared by Headphone and Lineout or
Headphone and Speaker, But Headphone, Lineout or Speaker they all have
independent Playback Switch, change to only use switch to mute the
Lineout or Speaker. This could resolve the issues of #747 and #1206.
See #1206 and #747
