dns/rfc2136: simplify for non-gwgroup reality

dns/rfc2136/src/etc/rc.rfc2136

@@ -34,18 +34,4 @@ require_once("filter.inc");
 require_once("services.inc");
 require_once("plugins.inc.d/rfc2136.inc");
 
-if (isset($argv[1])) {
-    $argument = trim($argv[1], " \n");
-} else {
-    $argument = null;
-}
-
-if (empty($argument)) {
-    rfc2136_configure_do(true);
-} else {
-    $interface = (new \OPNsense\Routing\Gateways(legacy_interfaces_details()))->getInterfaceName($argument);
-    if (empty($interface)) {
-        $interface = $argument;
-    }
-    rfc2136_configure_do(true, $interface);
-}
+rfc2136_configure_do(true);

dns/rfc2136/src/opnsense/service/conf/actions.d/actions_rfc2136.conf

@@ -1,6 +0,0 @@
-[reload]
-command:/usr/local/etc/rc.rfc2136
-description:RFC 2136 Update
-parameters:%s
-type:script
-message:updating rfc2136 %s