Fix assignment conversion for module set!.
Fix assignment conversion for module set!.

vishesh/pycket,krono/pycket,samth/pycket,cderici/pycket,krono/pycket,cderici/pycket,pycket/pycket,magnusmorton/pycket,samth/pycket,samth/pycket,vishesh/pycket,cderici/pycket,pycket/pycket,vishesh/pycket,krono/pycket,magnusmorton/pycket,pycket/pycket,magnusmorton/pycket