nnloglik_mod: ensure modZ remains a matrix after dropping duplicate columns

[ck37]

Hello,

Here is a quick fix to CC_nnloglik_mod to add a drop = FALSE when removing duplicate columns. I ran into the issue while testing a placeholder library with only two learners, and it ends up causing an error when ncol(modZ) is called while creating the bounds.

Thanks,
Chris

[benkeser]

thanks, Chris!