Malibu, Calif., is better known for providing respite from the hustle and bustle of Los Angles than for its fine-dining scene. But in recent years, the 26-mile-long scenic coastal town—which is home to the Robb Report headquarters—has blossomed as a dining destination unto itself. The newest feather in its culinary cap is the 11th installment of the Houston-based steak-house chain Mastro’s Restaurants. Mastro’s Ocean Club Malibu opened this summer right along the coastal retreat’s famed beachfront, with panora…