sct_label_utils: changed remove_labels for remove_or_keep_labels(self.value, action={'keep', 'remove'})
sct_label_utils: changed remove_labels for remove_or_keep_labels(self.value, action={'keep', 'remove'})


Former-commit-id: ec624a5d324d90bcddf03897b78c861cb55abc82
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox