TEST: updated test_sct_dmri_moco.py
TEST: updated test_sct_dmri_moco.py

Former-commit-id: d8e1624417be79dc327b1d0223a0a4f44cd4fd6f
Former-commit-id: a90df0babb3b1cc159688eea81fd3cbe53555cc9
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox