handle_final_shape_cb argument doesn't work on MultilineTool, PolygonTool, AnnotatedPolygonTool

[imad-miftek]

The handle_final_shape_cb argument on the AnnotatedPolygonTool does not call the callback function set to it. I can't get the shape object once the tool helps create the final shape.

The handle_final_shape_cb works as expected in the AnnotatedRectangleTool, and AnnotatedEllipseTool.

[PierreRaybaut]

Thanks for the feedback.
Actually the handle_final_shape_cb argument doesn't work on all tools deriving from MultilineTool.
This is a regression.
This is now fixed.