Remove getDet in CaloFutureElectron

The usage of getDet has to be removed from https://gitlab.cern.ch/lhcb/Rec/-/blob/master/CaloFuture/CaloFutureTools/src/CaloFutureElectron.cpp

It appears in 3 methods:

• closestState: used by https://gitlab.cern.ch/lhcb/Rec/-/blob/master/CaloFuture/CaloFutureMoniDst/src/CaloFutureAlignmentNtp.cpp which can actually be removed. So both CaloFutureAlignmentNtp.cpp and CaloFutureElectron::closestState should be removed
• caloTrajectoryL: not used, so it can also be removed too
• caloState: used by CaloFutureAlignmentNtp, CaloFutureElectronNtp and CaloFututreECorrection. The first 2 can be removed. In CaloFututreECorrection, caloState is called by computeDTheta, that is called by process. Since process here already takes DeCalorimeter as argument, one just needs to pass it as argument to computeDTheta and from there to caloState.

Also related to #330 (closed) FYI @sponce @bcouturi