pfblockerng-dev restarts unbound but DNSBL is disabled

[stepheng]

@elmnts Yes, I'll certainly re-install when the next version appears, or soon after, probably on a day when I'm at home by myself, and I've got a few hours to do some testing without danger of upsetting my partner's television viewing or internet use!

As I said, it isn't really urgent because I'm not running an environment where there is a particularly high risk of a user going somewhere they shouldn't or being hijacked, but it is nice to know the protection is there, particularly when life gets back to normal and we have visits from the younger family members who are all over social media!