Switched from parent type hard-coded FQCN to ::class keyword.

Author: DonCallisto

Form/Type/DoctrineType.php

@@ -22,6 +22,7 @@
 use Symfony\Component\Form\AbstractType;
 use Symfony\Component\Form\ChoiceList\Factory\CachingFactoryDecorator;
 use Symfony\Component\Form\Exception\RuntimeException;
+use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolver;
@@ -274,7 +275,7 @@ abstract public function getLoader(ObjectManager $manager, $queryBuilder, $class
 
     public function getParent()
     {
-        return 'Symfony\Component\Form\Extension\Core\Type\ChoiceType';
+        return ChoiceType::class;
     }
 
     public function reset()