NEW YORK — Fans of the Broadway adaptation of “To Kill a Mockingbird” will get a treat when the show restarts on this fall — Jeff Daniels and Celia Keenan-Bolger, two of the play’s original stars, are returning. Producers said Thursday that Daniels and Keenan-Bolger will once again play Atticus Finch and his daughter, Scout, starting Oct. 5 when the …