firewall/nat, disable nordr controls. closes https://github.com/opnsense/core/issues/1585

(cherry picked from commit f5c25d72)
(cherry picked from commit 2abbf0dc)

src/www/firewall_nat_edit.php

@@ -410,9 +410,12 @@ $( document ).ready(function() {
     $("#nordr").change(function(){
         if ($("#nordr").prop('checked')) {
           $(".act_no_rdr").addClass("hidden");
+          $(".act_no_rdr :input").prop( "disabled", true );
         } else {
           $(".act_no_rdr").removeClass("hidden");
+          $(".act_no_rdr :input").prop( "disabled", false );
         }
+        $(".act_no_rdr .selectpicker").selectpicker('refresh');
     });
 
     // trigger initial form change