TEST: fixed straightening test
TEST: fixed straightening test

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Former-commit-id: 8207c778cede60d96c2f4735dfb0c4f7c52eddfc
Former-commit-id: 985b437b2a28d98958aa49e2bfa95d59fb67cecb
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox