The hopefully last leak fix for MuPatHitTool

Walter Lamplrequested to merge
wlampl/athena:MuonCombLeakFix into master

call cleanUp through MuonCombinedAlg -> MuonCombinedTool -> MuonCombinedFitTagTool -> CombinedMuonTrackBuilder -> MuonSegmentRegionRecoveryTool -> MooCandidateMatchingTool -> MuPatCandidateTool -> MuPatHitTool

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