fix error when adding customfield choice

CustomFields/CustomFieldChoice.php

@@ -157,7 +157,7 @@ class CustomFieldChoice extends AbstractCustomField
             ->add(self::OTHER_VALUE_LABEL, TranslatableStringFormType::class, array(
                 'label' => 'Other value label (empty if use by default)'))
             ->add(self::CHOICES, ChoicesType::class, array(
-                'entry_type' => new ChoicesListType($this->defaultLocales),
+                'entry_type' => ChoicesListType::class,
                 'allow_add' => true
             ));