The nonprofit organization PEN America announced the winners of its annual literary awards Tuesday night, with Nana Kwame Adjei-Brenyah taking home the prestigious PEN/Jean Stein Award for book of the year for his debut short story collection, “Friday Black.” Adjei-Brenyah’s competition for the award, which comes with a $75,000 cash prize, included authors Tara Westover, Richard Powers, Ada Limón and …