Twentieth Century Fox was just days away from locking picture on “The Predator” when an urgent note came in: Delete the scene featuring Steven Wilder Striegel. Striegel, 47, didn’t have a big role in his longtime friend Shane Black’s reboot of the sci-fi thriller — just a three-page scene shared with actress Olivia Munn. But last month, Munn learned that Striegel is a registered sex offender who pleaded guilty in 2010 after facing allegations that he attempted to lure a 14-year-old female into a sexual relationship via the internet. When Munn shared the information with Fox on Aug. 15, studio...