Remove kint() debug in field widget
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #2934248. -->
Reported by: [acbramley](https://www.drupal.org/user/1036766)
>>>
<p>Stray debug code in the widget class.</p>
<pre>Error: Call to undefined function Drupal\entity_hierarchy\Plugin\Field\FieldWidget\kint() in Drupal\entity_hierarchy\Plugin\Field\FieldWidget\EntityReferenceHierarchySelect->formElement() (line 47 of modules/contrib/entity_hierarchy/src/Plugin/Field/FieldWidget/EntityReferenceHierarchySelect.php).</pre>
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