BUG : Fixed the parsing of one of the params in sct_straighten_spinalcord
BUG : Fixed the parsing of one of the params in sct_straighten_spinalcord


Former-commit-id: a8f250d6a5a27f6bedb23c20a83482cd8a3dd5c0
Former-commit-id: 46a857ada99a33f294373e6c8194154231336695
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox