OPT: correct path to get new registered template for validation
OPT: correct path to get new registered template for validation

Former-commit-id: ffbbc710d86fceb1ed847eb70598750375e1836e
Former-commit-id: 4c6fb369f45aa68410532689d7222248e1cc8bce
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox