The late British stage and screen actor Ian Charleson, who died of AIDS-related causes in 1990 at age 40, is mostly remembered for his role in the 1981 Oscar winner Chariots of Fire. That inescapable attachment haunts Charleson, played with raw determination, grace and an almost overwhelming depth of feeling by Andrew Scott in Elsinore, a tremendously moving account of the final year in the Scottish actor’s life. When his agent reminds him that he starred in one of the most celebrated films of all time, Charleson shoots back: “And all anybody can remember about it is the theme music.” Scott’s searing dual performance — as Charleson and…