TEST: faster check for sct_warp_template
TEST: faster check for sct_warp_template

Former-commit-id: 747a26e7f68fa4d1d8e6e7c11835f9046b91d056
Former-commit-id: aaeabac1eda95a4565b8a6ec984f45194ad685bc
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox