Allow custom_field RC4 in curated list

defaults/curated.json

@@ -9,7 +9,7 @@
   "DDQG-unsupported-drupal-conditional_fields-4.0.0.0-alpha5",
   "DDQG-unsupported-drupal-config_update-2.0.0.0-alpha3",
   "DDQG-unsupported-drupal-content_access-2.0.0.0",
-  "DDQG-unsupported-drupal-custom_field-3.0.0.0-RC3",
+  "DDQG-unsupported-drupal-custom_field-3.0.0.0-RC4",
   "DDQG-unsupported-drupal-default_content-2.0.0.0-alpha2",
   "DDQG-unsupported-drupal-elasticsearch_connector-7.0.0.0-alpha5",
   "DDQG-unsupported-drupal-entitygroupfield-1.0.0.0-beta1",