Parameter missing in DrawBeziers

I believe there is a missing parameter in D2DGraphics.DrawBeziers - first curve starting point. The D2DBezierSegment contains only two control points and end path point (while you need 4 points for cubic bezier). You use the first control point also as a first main point of cubic bezier:

```
context->factory->CreatePathGeometry(&path);
path->Open(&sink);
//sink->SetFillMode(D2D1_FILL_MODE_WINDING);
sink->BeginFigure(bezierSegments[0].point1, D2D1_FIGURE_BEGIN_FILLED); //error - here you should add additional parameter as starting point
```

Start at D2DGraphics.DrawBeziers and inspect how D2DBezierSegment values are passed to CreatePathGeometry and BeginFigure. Confirm whether the first control point is incorrectly used as the cubic Bézier starting point, then verify that the drawing path uses the intended four points and preserves existing rendering behavior.

Written by the indexing model from the issue text.