PARK WARS: In bad economic times, the theme for Orange County's two major amusement parks seems to be rampant discounting. . . . Disneyland recently sold kids-free tickets through Vons, Knott's Berry Farm through Ralphs. Both sides claimed success in the supermarket war, so expect more discounting. Knott's may soon hook up with Lucky Stores, and Disneyland will give a break to local residents. "People are very price sensitive," says a Knott's official.