Fix schemas available on Document doc type

The "Document" document type contribution is defined to hold the "uid", "dublincore" and "common" schemas but the definition on Nuxeo side does not include them => they should be added every time they're missing, not only when the direct parent type is "Document".

Otherwise, for instance, a document that inherits Folder in Studio shows that it has all these schemas, but the generated type does not really hold them.