While not the classic that "Hobson's Choice" has become, Harold Brighouse's follow-up play "Zack" proves to be a charming Edwardian comedy drama in the Mint Theater Company's production which may be the first full New York production since 1916. Ironically, Zack has a great many things in common with "Hobson's Choice" probably best known from the awarding-winning 1954 Sir David Lean film with Charles Laughton, John M…