Wrong group option for incusd service
# Description:
The command line for the `incusd.service` users `incusd-admin` (which does not exist) as group, rather than `incus-admin`:
```
ExecStart=/usr/bin/incusd --group=incusd-admin --logfile=/var/log/incus/incusd.log
```
# Additional info:
* package version(s): 0.4-1
issue