Fix TgcHitClusterObj issues in MuonLayerHoughTool
This should fix the issues related to TgcHitClusterObjs.
There were two bugs:
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A vector was passed by value instead of by ref.
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TgcHitClusteringObjs were deleted along with MuonLayerHoughTool::State, while the Hits in the HoughDataPerSectorVec (which lives on in StoreGate) kept references the TgcHitClusteringObj.
I also added the removal of an IncidentSvc listener in finalize()