Remove Init() from HadronicElasticModel.

Processes/HadronicElasticModel/HadronicElasticModel.cc

@@ -24,8 +24,6 @@ using SetupParticle = corsika::setup::Stack::ParticleType;
 
 namespace corsika::process::HadronicElasticModel {
 
-  void HadronicElasticInteraction::Init() {}
-
   HadronicElasticInteraction::HadronicElasticInteraction(units::si::CrossSectionType x,
                                                          units::si::CrossSectionType y)
       : fX(x)

Processes/HadronicElasticModel/HadronicElasticModel.h

@@ -50,7 +50,6 @@ namespace corsika::process::HadronicElasticModel {
     HadronicElasticInteraction( // x & y values taken from DL for pp collisions
         units::si::CrossSectionType x = 0.0217 * units::si::barn,
         units::si::CrossSectionType y = 0.05608 * units::si::barn);
-    void Init();
 
     template <typename Particle>
     corsika::units::si::GrammageType GetInteractionLength(Particle const& p);