forward false label option to nested types

This change does not fix any built-in Symfony form themes, but takes
into account the changes made in symfony#28469 to allow third-party form themes
work properly.

Author: xabbuh

src/Symfony/Component/Form/Extension/Core/Type/DateTimeType.php

@@ -134,6 +134,11 @@ public function buildForm(FormBuilderInterface $builder, array $options)
                 'invalid_message_parameters',
             )));
 
+            if (false === $options['label']) {
+                $dateOptions['label'] = false;
+                $timeOptions['label'] = false;
+            }
+
             if (null !== $options['date_widget']) {
                 $dateOptions['widget'] = $options['date_widget'];
             }