DISCOVERING SPUNK: Those characters from the "Super Mario Brothers" Nintendo games are going big-screen, and it could be a chance for some lucky young woman to become a star. . . . "We're looking for someone with that certain magic," says casting agent Mali Finn. The Roland Jaffe production is auditioning for the role of Daisy, the love interest in the PG-rated movie. An open casting call from 4 to 7 p.m. is scheduled for Monday at Cal State Fullerton's Little Theatre. Finn wants "spunkiness." No experience necessary.