Manhattan prep school officials and parents aren't the only ones who hope the NYPD tracks down and arrests a defrocked priest accused of molesting a student. His son wants him behind bars, too. "I'd love to see him get caught," Aaron Jacques, 25, the youngest child of school fund-raiser Bruce Jacques, told the Daily News yesterday. "If he really did what they say he did, that would make my day." Bruce Jacques, 57, is on the run after a male student at the Robert Louis Stevenson School on W. 74th St. claimed the ex-priest sexually assaulted by him in Central...