[Queue-2.0] Discriminator Column is explicit, but gives a Hibernate warning

HHH000457: Joined inheritance hierarchy [nl.tudelft.queue.model.Lab] defined explicit @DiscriminatorColumn. Legacy Hibernate behavior was to ignore the @DiscriminatorColumn. However, as part of issue HHH-6911 we now apply the explicit @DiscriminatorColumn. If you would prefer the legacy behavior, enable the hibernate.discriminator.ignore_explicit_for_joined setting (hibernate.discriminator.ignore_explicit_for_joined=true)