Remove ahbl.org blacklists after site shutdown

scripts/dns-blacklist.nse

@@ -19,7 +19,6 @@ PROXY) or to a specific service name.  ]]
 -- | dns-blacklist:
 -- | 1.2.3.4
 -- |   PROXY
--- |     dnsbl.ahbl.org - PROXY
 -- |     dnsbl.tornevall.org - PROXY
 -- |       IP marked as "abusive host".
 -- |       Proxy is working
@@ -35,13 +34,11 @@ PROXY) or to a specific service name.  ]]
 -- Supported blacklist list mode (--script-args dns-blacklist.list):
 -- | dns-blacklist:
 -- |   PROXY
--- |     dnsbl.ahbl.org
 -- |     socks.dnsbl.sorbs.net
 -- |     http.dnsbl.sorbs.net
 -- |     misc.dnsbl.sorbs.net
 -- |     dnsbl.tornevall.org
 -- |   SPAM
--- |     dnsbl.ahbl.org
 -- |     dnsbl.inps.de
 -- |     bl.nszones.com
 -- |     l2.apews.org