Fixed bug in CPU 3D DFT function oskar_dftw_m2m_3d_omp.
Fixed bug in CPU 3D DFT function oskar_dftw_m2m_3d_omp.

The supplied DFT weights were being ignored.
Fortunately this function was not called in previous OSKAR versions.

OxfordSKA/OSKAR,OxfordSKA/OSKAR,OxfordSKA/OSKAR,OxfordSKA/OSKAR