INST: copy_ants_binaries: added slash at the end
INST: copy_ants_binaries: added slash at the end

Former-commit-id: c457f9dba5ff354159f13d9d771c579c2215ed95
Former-commit-id: 59da3347dfd2783d20dc110fa4031458cb4530e3
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox