FIX: Fixes broadcasting error in structure factor calc
FIX: Fixes broadcasting error in structure factor calc

Previously, sparse arrays could not be used because they would not be broadcast correctly into the initialized zero FQ array.

pseudocubic/neutronpy,neutronpy/neutronpy,granrothge/neutronpy,granrothge/neutronpy,neutronpy/neutronpy,pseudocubic/neutronpy