Theater review THE LOST BOYS Two hours and 40 minutes, with one intermission. At the Palace Theatre, 160 W. 47th Street. At long last, a vampire musical that doesn’t suck. A captivating and moody rock show about teenage fangst, “The Lost Boys,” flew open Sunday night at the Palace Theatre and brought an end to the decades-old curse unleashed by a string of unfortunate aughts Broadway mega-flops: “Dracula,” “ Dance of the Vampires ” and “ Lestat .” That tacky trilogy of terror has been the target of mockery for so long that simply walking into a new entry in the singin’ undead genre is scarier than anything Count Orlok does in “Nosferatu.” Even more frightening, lousy “Lestat” also played the Palace. Eeeek! But once the lights dim and a striking opening scene commences — in which a cop is violently killed midair by a group of rocking vamps — it becomes immediately clear that there is nothing here to ridicule this time.…