Remove unused use.

tests/TestCase/ORM/TableTest.php

@@ -26,7 +26,6 @@ use Cake\Datasource\EntityInterface;
 use Cake\Event\Event;
 use Cake\Event\EventManager;
 use Cake\I18n\Time;
-use Cake\ORM\Association\BelongsTo;
 use Cake\ORM\AssociationCollection;
 use Cake\ORM\Association\BelongsToMany;
 use Cake\ORM\Association\HasMany;