Lit: Remove Bremsstrahlung energy loss for electrons and replace with existing Bethe Bloch for electrons #3019

• The Lit extrapolator was using Bremsstrahlung for the energy loss calculation in case of electrons, which resulted in wrong momentum updates and therefore wrong extrapolations (see issue #3019)
• Replaced with BetheBloch energy loss specialized for electrons/positrons which was already implemented, the energy loss depends on charge which needs to be checked since such charge dependent asymmetry is not observed in geant3. Also is is to large by a factor of 2 when comparing with geant3.
• Other extrapolations by the LitExtrapolator were correct, since muon or pion particle hypothesis are used, where the energy loss is not calculated via Bremsstrahlung (full bethe bloch instead)