fixed EllipticArc rotation direction

Author: derBobo

src/ImageSharp.Drawing/Shapes/EllipticalArcLineSegment.cs

@@ -43,7 +43,7 @@ public EllipticalArcLineSegment(float x, float y, float radiusX, float radiusY,
             this.y = y;
             this.radiusX = radiusX;
             this.radiusY = radiusY;
-            this.rotation = rotation % 360;
+            this.rotation = -rotation % 360;
             this.startAngle = startAngle % 360;
             this.transformation = transformation;
             this.sweepAngle = sweepAngle;