Remove sort control from public item set browse

Item set order is currently set manually by site admins in the Resources
tab.

application/view/omeka/site/item-set/browse.phtml

@@ -3,24 +3,6 @@ $escape = $this->plugin('escapeHtml');
 $translate = $this->plugin('translate');
 
 $this->htmlElement('body')->appendAttribute('class', 'item-set resource browse');
-$sortHeadings = [
- [
- 'label' => $translate('Title'),
- 'value' => 'dcterms:title'
- ],
- [
- 'label' => $translate('Identifier'),
- 'value' => 'dcterms:identifier'
- ],
- [
- 'label' => $translate('Class'),
- 'value' => 'resource_class_label'
- ],
- [
- 'label' => $translate('Created'),
- 'value' => 'created'
- ],
-];
 ?>
 
 <?php echo $this->pageTitle($translate('Item sets'), 2); ?>
@@ -30,7 +12,6 @@ $sortHeadings = [
 <div class="browse-controls">
  <?php echo $this->pagination(); ?>
  <?php echo $this->hyperlink($translate('Advanced search'), $this->url(null, ['action' => 'search'], true), ['class' => 'advanced-search']); ?>
- <?php echo $this->sortSelector($sortHeadings); ?>
 </div>
 
 <?php $this->trigger('view.browse.before'); ?>