Fix duplicate key

Author: baszoetekouw

roles/manage/templates/application.yml.j2

@@ -64,9 +64,8 @@ product:
 metadata_configuration_path: file://{{ manage_dir }}/metadata_configuration
 metadata_templates_path: file://{{ manage_dir }}/metadata_templates
 metadata_export_path: classpath:/metadata_export
-disabled_metadata_schemas: "organisation.schema.json"
-
-disabled_metadata_schemas: []
+disabled_metadata_schemas:
+  - "organisation.schema.json"
 
 security:
   backdoor_user_name: {{ manage.backdoor_api_user }}