fix deprecations: use fqcn

Controller/CustomFieldController.php

@@ -4,9 +4,12 @@ namespace Chill\CustomFieldsBundle\Controller;
 
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Bundle\FrameworkBundle\Controller\Controller;
+use Symfony\Component\Form\Extension\Core\Type\SubmitType;
+
 use Chill\CustomFieldsBundle\Entity\CustomField;
 use Chill\CustomFieldsBundle\Form\CustomFieldType;
 
+
 /**
  * CustomField controller.
  *
@@ -62,7 +65,7 @@ class CustomFieldController extends Controller
             'group_widget' => ($entity->getCustomFieldsGroup()) ? 'hidden' :'entity'
         ));
 
-        $form->add('submit', 'submit', array('label' => 'Create'));
+        $form->add('submit', SubmitType::class, array('label' => 'Create'));
 
         return $form;
     }
@@ -154,7 +157,7 @@ class CustomFieldController extends Controller
             'group_widget' => 'hidden'
         ));
 
-        $form->add('submit', 'submit', array('label' => 'Update'));
+        $form->add('submit', SubmitType::class, array('label' => 'Update'));
 
         return $form;
     }

Form/Type/ChoicesListType.php

@@ -5,6 +5,8 @@ use Symfony\Component\Form\AbstractType;
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Form\FormEvent;
 use Symfony\Component\Form\FormEvents;
+use Symfony\Component\Form\Extension\Core\Type\CheckboxType;
+use Symfony\Component\Form\Extension\Core\Type\HiddenType;
 
 use Chill\MainBundle\Form\Type\TranslatableStringFormType;
 
@@ -26,10 +28,10 @@ class ChoicesListType extends AbstractType
         $locales = $this->defaultLocales;
 
         $builder->add('name', TranslatableStringFormType::class)
-            ->add('active', 'checkbox', array(
+            ->add('active', CheckboxType::class, array(
                 'required' => false
             ))
-            ->add('slug', 'hidden', array(
+            ->add('slug', HiddenType::class, array(
 
             ))
             ->addEventListener(FormEvents::SUBMIT, function(FormEvent $event) use ($locales){