chore(nslord): remove deprecated and now obsolete settings

nslord/conf/pdns.conf.var

@@ -3,12 +3,9 @@ api=yes
 api-key=${DESECSTACK_NSLORD_APIKEY}
 default-api-rectify=no
 default-soa-edit=INCREMENT-WEEKS
-default-soa-mail=get.desec.io
-default-soa-name=set.an.example
 default-ttl=${DESECSTACK_NSLORD_DEFAULT_TTL}
 setgid=pdns
 setuid=pdns
-soa-minimum-ttl=60
 version-string=powerdns
 webserver=yes
 webserver-address=${DESECSTACK_IPV4_REAR_PREFIX16}.1.11