Fix member function names in ParticleCombination

Miguel Ramos Pernasrequested to merge
mramospe-fix-particle-combination into master

Fix some naming problems in ParticleCombination that were detected at runtime in Moore when creating combinations of v2 particle objects.

Related to LHCb!3378 (merged), Moore!1274 (merged)

Edited by Miguel Ramos Pernas

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