sct_label_utils: fixup staticmethod accessing self
sct_label_utils: fixup staticmethod accessing self


Former-commit-id: e147ef7cea5d7299a0a0d0ba02e169d593445f47
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox