isn't hyprpolkitagent dbus activated?

```bash
$ cat /usr/share/dbus-1/services/org.hyprland.hyprpolkitagent.service

[D-BUS Service]
Name=org.hyprland.hyprpolkitagent
Exec=/usr/lib/hyprpolkitagent/hyprpolkitagent
SystemdService=hyprpolkitagent.service
```

So why do we need to use `exec-once`?

- https://wiki.hypr.land/Useful-Utilities/Must-have/#authentication-agent
- https://wiki.hypr.land/Hypr-Ecosystem/hyprpolkitagent/#usage