5ttgen hsvs: Revert default thalamic segmentation to FIRST
5ttgen hsvs: Revert default thalamic segmentation to FIRST

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