The late August Wilson’s play “Radio Golf,” the last in his series of 10 insightful dramas about African-American life in the 20th century — including Pulitzer Prize-winners “Fences” (1987) and “The Piano Lesson” (1990) — is currently being performed through Oct. 6 at Hyde Park’s Court Theatre.Completed shortly before Wilson’s death in 2005, it is about black life in 1997 in Pittsburgh’s Hill District and, despite the gains made by African-Americans in …