bug#52031: gnome-terminal fails to start under sway on core-updates-frozen

[Jack Hill]

Hi Guix,

With core-updates-frozen commit b033079e47357dcf77ebeeb52b0a5306cd6aa982 
gnome-terminal fails to start under sway either as launched from gdm or 
directly from a vt with `dbus-run-session sway`.

```
$ gnome-terminal
# Error constructing proxy for org.gnome.Terminal:/org/gnome/Terminal/Factory0: 
Error calling StartServiceByName for org.gnome.Terminal: Process 
org.gnome.Terminal exited with status 10
```

It works correctly in a gnome session.

Best,
Jack