Revert PR2250 - Enum rationalise

[RichardWallis]

Revert config to preserve previous definition files so we can revisit later.

[Eyas]

👍 I was looking at the current 6.0 schema on webschemas.org, and some of the rationalization was interesting:

• DrugClass has a type MedicalEnumeration (which has typically meant a value is an enum value) but appears in domainIncludes of the drugClass category as a type in and of itself.
  • If DrugClass is referenced as a type, then it should have the rdf:type of rdfs:Class

[danbri]

Ok, we are reverted