fix cosine (#1125)

planetiler-core/src/main/java/com/onthegomap/planetiler/geo/VWSimplifier.java

@@ -155,7 +155,7 @@ public class VWSimplifier extends GeometryTransformer implements Function<Geomet
     double den = Math.hypot(bx - ax, by - ay) * Math.hypot(cx - bx, cy - by),
       cos = 0;
     if (den > 0) {
-      cos = Math.clamp((ax - bx) * (cx - bx) + (ay - by) * (cy - by) / den, -1, 1);
+      cos = Math.clamp(((ax - bx) * (cx - bx) + (ay - by) * (cy - by)) / den, -1, 1);
     }
     return cos;
   }