[racket] render-metafunction font size

[Jon Rafkind]

I am using `render-metafunction' from redex/pict inside a scribble document but 
the resulting pict's font is too large. How can I make it smaller, or 
preferabbly use the same font size as the rest of the document? I found 
`current-font-size' from slideshow/base but that doesn't seem to be the right 
thing to use.
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