Selome Hailu Gearing up for the final episodes of ABC’s “Black-ish,” 22-year-old Marcus Scribner was happy with his performance in the long-running hit sitcom.“I was ready to move on from the character,” says Scribner, who was 14 when “Black-ish” debuted, with Anthony Anderson and Tracee Ellis Ross in the leading roles as Andre and Rainbow Johnson. “But they were like, ‘Hold on one minute.