Fixed another silly indent

lib/graph3d/Graph3d.js

@@ -985,7 +985,7 @@ Graph3d.prototype._redrawLegend = function() {
     y = bottom - (step.getCurrent() - legendMin) / (legendMax - legendMin) * height;
     from  = new Point2d(left - gridLineLen, y);
     to    = new Point2d(left, y);
-		this._line(ctx, from, to);
+    this._line(ctx, from, to);
 
     ctx.textAlign = 'right';
     ctx.textBaseline = 'middle';