Fix fourkeys mode for Frue derived ROMs + VIP Card/Door Key naming fix

Frue derived ROMs use a different name for the Basement, Dankirk, and Narcysus keys which wasn't accounted for in four keys generation, which caused assertion failures.
Stop Door Key and VIP Card being renamed to 'Useless key':
- VIP Card isn't a key and still works for the VIP room at Markao, so still useful
- Door Key is given by default, so while it doesn't matter that much, 'Useless key' shows up in the Scenario screen otherwise:

abyssonym / terrorwave