BUG: fixed name issue for sct_register_multimodal, related to #373
BUG: fixed name issue for sct_register_multimodal, related to #373

Former-commit-id: 36c4e16a90f782bd709e5292a4cfed80152f4cf9
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox