INST: install_sct: reordered launcher creation (otherwise delete previous binaries)
INST: install_sct: reordered launcher creation (otherwise delete previous binaries)

Former-commit-id: ed5b7a364026d6a5a6a6abf080314eb0ff3ec777
Former-commit-id: e82b67208340b2a58f5c935f5a5daac58b18fd05
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox