BUG: sct_register_pipeline: adapted to the new sct_register_to_template and sct_register_multimodal
BUG: sct_register_pipeline: adapted to the new sct_register_to_template and sct_register_multimodal

Former-commit-id: b80129070534b77177041207d9a115d7cd2d234e
Former-commit-id: 8152b76636868672101578a5664bad70d1a9b6c7
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox