Bug fix in GMWMI seeder
Bug fix in GMWMI seeder

Error was resulting in unnecessary rejection of many seeds (accepted by the seeder but failing the ACT test of the seed), which was resulting in inhomogeneity in the seed distribution.

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