reimplement `MuonFastPosTool` in terms of `ComputeTilePosition`
LHCb!2212 (merged) introduced ComputeTilePosition
in Det/MuonDet
as a 'derived' condition which replaces the functionality of MuonFastPosTool
, by copying the code of MuonFastPosTool
to ComputeTilePosition
. This MR implements MuonFastPosTool
in terms of ComputeTilePosition
, to de-duplicate the code.
Note: this MR depends on LHCb!2212 (merged), and should only applied in conjunction or after it. The converse is not the case, i.e. lhcb/LHCb!22112 can be applied independent of this MR.