BUG: register_to_template: fixed typo that prevented to set flag -cpu-nb
BUG: register_to_template: fixed typo that prevented to set flag -cpu-nb

Former-commit-id: 375af639b06d228a2ffb1c1c9a07ad45577a40a9
Former-commit-id: 89ff04d125f9c91607d82211efb256166395dc28
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox