Scenes from "Nickel Boys" and "Exhibiting Forgiveness." It’s been over a decade since “12 Years a Slave” and “Fruitvale Station” were released, and white people’s proximity to a Black narrative still weighs heavily on their acclaim for it. This year’s “Nickel Boys” and “Exhibiting Forgiveness” are two other Black films that have had parallel journeys to the big screen and …