Prefer to list all enums to handling defaults, this makes it easier to
catch missing cases in the future.

Change-Id: Idae2f445bd907f62202a6b68da0d030e21863afe
Reviewed-by: Alexandru Croitor <alexandru.croitor@theqtcompany.com>
Reviewed-by: Kai Koehne <kai.koehne@qt.io>