EnergyLossUpdator we seem to always use the TrkExUtils parametrization

EnergyLossUpdator we seem to always use the TrkExUtils parametrization

the default was true . And for the energy loss we seem to never change it :

• https://acode-browser1.usatlas.bnl.gov/lxr/search?%21v=head&_filestring=&_string=UseTrkUtils (we change it for Multiple Scattering)
• https://acode-browser1.usatlas.bnl.gov/lxr/ident?_i=AtlasEnergyLossUpdatorCfg

I recall had discussed this with @tstreble and I think indeed we only set this for the MS in the GX2. Also let me ping @beyeo as him trying to debug some lines is what prompted me to try and clean up this code that seems "dead" or hope it is ....