Small cleanup of TrackBestTrackCreator
Essentially put it in LHCb namespace
Part of set of MRS LHCb!3785 (merged) Lbcom!628 (merged) !3123 (merged)
Essentially put it in LHCb namespace
Part of set of MRS LHCb!3785 (merged) Lbcom!628 (merged) !3123 (merged)