As “Toad” in “American Graffiti,” Charles Martin Smith took playing the school nerd to new heights. Over 50 years later, the California-born actor-director co-stars opposite Toronto actress Anwen O’Driscoll in “This Time,” director Robert Vaughn’s very modern road picture. Catch it June 19, 20; July 15 and 24; and Aug. 4 and 27 on Super