Fix sbws default configuration path depending on the user running it

This seems to be an issue in the debian package but could be fixed in the source too. The issue is that debian cron job user (sbws) searchs for sbws config file in /var/lib/sbws/.sbws.ini instead of /etc/sbws/sbws.ini. Some options to fix this:

• use systemd timer and the SUPERVISED env var in the deb package
• use SUPERVISED env var in the cron job in the deb package
• use -c config in the cron job in the deb package
• ...