[racket] Missing turtle

The problem seems to be, that the only place draw-turtle-icons
is called is in on-paint. This event is only called when

>         Specification: Called when the canvas is exposed or
>         resized so that the image in the canvas can be repainted.

And indeed if one issues commands in the repl and then resizes the
window, the orange triangle is updated.

-- 
Jens Axel Søgaard
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