GARY CARTER IS A GEEK. This sounds strange, doesn’t it? How many major league Hall of Famers with bulging muscles and boyish good looks have been grouped with Screech, Steve Urkel, and Potsie Webber on the all-time uncool list? The facts, however, are indisputable. Carter is the anti-Fonzie, as koolamundo as a pair of neon pink leg warmers and the L.A. Gears to match. He doesn’t: