Fix a getByToken call in RecoTauTag/HLTProducers/src/CandidateSeededTrac...

Fix a getByToken call in RecoTauTag/HLTProducers/src/CandidateSeededTrackingRegionsProducer.h
as noticed by Dominick Olivito in https://hypernews.cern.ch/HyperNews/CMS/get/hlt/3446.html