Our SIXXS address is long gone, so let's not publish it anymore.

We forgot to remove it for kde.org when we removed it for www.kde.org when decomissioning our SIXXS tunnel as part of their shutdown.
CCBUG: 379136

zones/kde.org.zone

@@ -7,7 +7,6 @@ $TTL 1800
                     IN  MX 10   postbox.kde.org.
                     IN  TXT     "v=spf1 mx ip4:208.118.235.41 ip6:2001:4830:134:8::100 ?all"
                     IN  A       91.189.93.5
-                    IN  AAAA    2a01:348:6:42f::2
 localhost           IN  A       127.0.0.1
 _xmpp-client._tcp   IN  SRV     5 0 5222 spring.kde.org.
 _xmpp-server._tcp   IN  SRV     5 0 5269 spring.kde.org.