Issue #2707057 by damiankloip, swentel, dawehner: Remove no_ui from timestamp field type

core/lib/Drupal/Core/Field/Plugin/Field/FieldType/TimestampItem.php

@@ -13,7 +13,6 @@
  *   id = "timestamp",
  *   label = @Translation("Timestamp"),
  *   description = @Translation("An entity field containing a UNIX timestamp value."),
- *   no_ui = TRUE,
  *   default_widget = "datetime_default",
  *   default_formatter = "timestamp",
  *   constraints = {