Surface::Algo::image2mesh_blocky(): Fix RH rule of output
Surface::Algo::image2mesh_blocky(): Fix RH rule of output

MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3