Add test of Muon digits to MC particle linking.
The following discussion from !712 (merged) should be addressed:
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@apearce started a discussion: (+5 comments) This typo was introduced in !687 (merged) but it wasn't spotted because nothing calls this function (I guess). Does that sound reasonable @ldufour @chasse @sstahl? Should we add a test which uses the stuff here, or can it be deleted?