OPT: change the debug parameters to sct_testing_data
OPT: change the debug parameters to sct_testing_data

Former-commit-id: 6756e0266636d42de6976b846b01a5995640657b
Former-commit-id: a1901cde7b86d964bcc5217b969e268f5badb3a9
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox