BUG: fixed name mistake in straighten_spinalcord
BUG: fixed name mistake in straighten_spinalcord

Former-commit-id: 83d88c07601743ef6ee3b1baea90a1a06042da48 [formerly c7ff66e1df0b9018feb0febe940a03395b95a8c5]
Former-commit-id: a289c87b896453e8dea6d3d390ee7b088eab5627
Former-commit-id: 96702f8d109e00aba3ff1df5271eeb30f82f7a4d
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox