fix Pixmap 3 drawing test by fixing args to copy-to-pixmap
fix Pixmap 3 drawing test by fixing args to copy-to-pixmap

 * we need to (copy-to-pixmap stream ...) to draw on the
   stream/medium's pixmap. copy-to-pixmap takes a medium as its first
   argument, not a pixmap.

slyrus/mcclim,slyrus/mcclim