graphblas.matrix_multiply_reduce_to_scalar_generic doesn't take a mask_complement attribute

[paul-tqh-nguyen]

graphblas.matrix_multiply_reduce_to_scalar_generic doesn't take a mask_complement attribute, but graphblas.matrix_multiply_generic does. Is there any particular reason for this?

CC @seibert

[jim22k]

Because I forgot to add it when I updated matrix_multiply with a mask_complement. It should exist, because the mask/mask complement affects the reduction.