Fix typo in EPOS.py (LbCRMC package) into 'master'

Gloria Cortirequested to merge
cherry-pick-078e2207 into master

Fix typo in EPOS.py (LbCRMC package) [LHCBGAUSS-1083] This fixes 'LHCBGAUSS-1083'

See merge request !93 (merged)

Edited by Gloria Corti

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