Fix output message in `install_cuda_and_libraries.sh` #1056

Job	Run time
eessi_container_script (listrepos_custom)	1m 22s
eessi_container_script (resume)	2m 17s
eessi_container_script (run)	2m 0s
eessi_container_script (unionfs)	2m 52s
eessi_container_script (no_cvmfs_mounts)	3m 26s
eessi_container_script (help)	1m 32s
eessi_container_script (listrepos_default)	1m 19s
eessi_container_script (container)	2m 41s
eessi_container_script (shell)	2m 33s
eessi_container_script (exec)	2m 27s
	22m 29s

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