HHH-8111 AttributeConverters were not mapping to the correct types

Given an `AttributeConverter` of property type `X` and database type `Y`, Hibernate was attempting to map `Y` to the database column. This was not correct, because if `Y` could map to the database column the `AttributeConverter` wouldn't be necessary. Hibernate should have been attempting to map `X`, the database type that the converter converts the property to.

This only manifested if the property type was already one that Hibernate already supports, such as `String`, `long`, etc. Importantly, since Hibernate automatically handles all `Serializable` properties by serializing them, this problem applied to a broad set of types. If you removed `Serializable` from the type, for example, Hibernate would start mapping it correctly.

This VERY simple commit resolves this issue by ensuring that Hibernate maps `X` to the table, not `Y`.