Improve geo_node_form.js

app/assets/javascripts/geo/geo_node_form.js

 export default class GeoNodeForm {
   constructor(container) {
-    this.$container = $(container);
+    this.$container = container;
     this.$namespaces = this.$container.find(".js-namespaces");
     this.$namespacesSelect = this.$namespaces.find('.select2');
     this.$primaryCheckbox = this.$container.find("input[type='checkbox']");
@@ -9,11 +9,6 @@ export default class GeoNodeForm {
 
   onPrimaryCheckboxChange(event) {
     this.$namespacesSelect.select2('data', null);
-
-    if (this.$primaryCheckbox.is(':checked')) {
-      this.$namespaces.addClass('hidden');
-    } else {
-      this.$namespaces.removeClass('hidden');
-    }
+    this.$namespaces.toggleClass('hidden', this.$primaryCheckbox.is(':checked'))
   }
 }