Issue #3158794 by ebasby: Drupal 9 - Error: [MixItUp] The provided selector yielded no container element

Closes #3158794

js/mixitup_views.js

@@ -34,7 +34,7 @@
 
           switch(self.widgetType) {
             case 'checkboxes' :
-              self.$filters.find('.form-type-checkbox').each(function () {
+              self.$filters.find('.mixitup-checkboxes .form-item').each(function () {
                 self.groups.push({
                   $inputs: $(this).find('input'),
                   active: [],
@@ -43,7 +43,7 @@
               });
               break;
             case 'select' :
-              self.$filters.find('.form-type-select').each(function () {
+              self.$filters.find('.mixitup-select .form-item').each(function () {
                 self.groups.push({
                   $selects: $(this).find('select'),
                   active: [],