Fix cscTriggerPrimitiveDigis configuration in Run 2 eras

[mark-grimes]

Found a difference between the Run 2 eras and the customisations, fairly trivial fix.

[cmsbuild]

A new Pull Request was created by @mark-grimes (Mark Grimes) for CMSSW_7_4_X.

Fix cscTriggerPrimitiveDigis configuration in Run 2 eras

It involves the following packages:

L1Trigger/CSCTriggerPrimitives

@cmsbuild, @nclopezo, @mulhearn can you please review it and eventually sign? Thanks.
@valuev, @Martin-Grunewald this is something you requested to watch as well.
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@Degano you are the release manager for this.
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