[Enchantment] Generator allows invalid minecraft:reference predicate

[AdVerhoeven]

Conditions in enchantments are not allowed to use predicate references at the moment, this option should not be available in the editor/generator.

If you do use a requirement with a reference your world will fail to open and you get the following logs:
java.lang.IllegalStateException: Validation error in enchantment effect condition: at : Uses reference to your_pack:your_predicate, but references are not allowed;