[Fluxus] nurbs state mixup

[gabor papp]

hi,

i found a new bug with the nurbs primitive. if (hint-wire) is used with 
the nurbs primitive, the other primitives are not rendered properly.

(clear)

(define p (build-nurbs-sphere 10 10))

(with-primitive p
    (hint-wire))

; this cube should be solid
(with-state
    (translate #(2 0 0))
    (build-cube))

best,
gabor