Peter Debruge Chief Film CriticThe closer you look at the subject of beauty, the uglier it appears. Meanwhile, wealth is obscene from practically every angle. Irreverent Swedish satirist Ruben Östlund gets right up in there, probing the pores of the elitist worlds of supermodels and the mega-rich in “Triangle of Sadness,” which takes its name from a fashion-world term for the deep-V crease that appears between one’s eyebrows with stress or age.