ui: actually use the label that is going to be appended

optgroups don't have labels so this works as well.

Author: fichtner

src/opnsense/www/js/opnsense_ui.js

@@ -917,7 +917,7 @@ $.fn.replaceInputWithSelector = function (data, multiple=false) {
                     optgrp.append($("<option/>").val(key2).text(this_item));
                 });
                 options.push(optgrp);
-            } else if (data[key].title === undefined) {
+            } else if (data[key].label !== undefined) {
                 options.push($("<option/>").val(empty_select_token).text(data[key].label));
             }
         });