OPT: use correct function name for isct_test_function
OPT: use correct function name for isct_test_function

Former-commit-id: 1ca723410f6747325a2b5151fecb702567d6e22e
Former-commit-id: 6ed241298c92f8afb1211a48b4cb427e7cc52611
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox