Fix typo in `create_lmodsitepackage.py` #1941

Job	Run time
eessi_container_script (help)	7m 31s
eessi_container_script (listrepos_default)	9m 27s
eessi_container_script (listrepos_custom)	8m 50s
eessi_container_script (run)	10m 33s
eessi_container_script (shell)	10m 52s
eessi_container_script (container)	10m 57s
eessi_container_script (resume)	11m 20s
	1h 9m 30s

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