Hgc digithr g4cutrange

Updates to HGCal digitization
Changing range cut in Geant4 in Si for e/gamma to 30microns (~1/3 Si width)
@vandreev11 Can you check as well?
Could this be made a std::unique_ptr?  Or left as a standard data member.  There is no corresponding delete for the new.  Having said that I'm pretty sure only one HGCDigitizer is instantiated (is it?) so the leak isn't that big.