sct_warp_template: WarpTemplate: remove dead ctor argument
sct_warp_template: WarpTemplate: remove dead ctor argument


Former-commit-id: a84df94078b2f025a93b42af062f5d837fb6bf49
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox