Remove last get/setTransform (#964)

My original hack to put the scale when we create the canvas element doesn't make much sense. It should be done when we are rendering the scene. I moved it there in this PR.

The rest was all about forwarding the scale to where it's needed.

src/scene/export.ts

@@ -36,7 +36,6 @@ export function exportToCanvas(
   const height = distance(minY, maxY) + exportPadding * 2;
 
   const tempCanvas: any = createCanvas(width, height);
-  tempCanvas.getContext("2d")?.scale(scale, scale);
 
   renderScene(
     elements,