Riding high on its Season 14 renewal, “Blue Bloods” is set to host a major reunion during its 13th season — though it’s between Tom Selleck and one of his “Magnum P.I.” castmates and not the rest of the Reagan family and their long-lost relative Nicky Boyle-Reagan (Sami Gayle). Larry Manetti, who played Orville “Rick” Wright on…