Migrate BeamEffects package to use (Const)GenParticlePtr

Simulation/BeamEffects/src/GenEventBeamEffectBooster.h

@@ -57,7 +57,7 @@ namespace Simulation {
     /** calculate the transformations that we want to apply to the particles in the current GenEvent */
     StatusCode initializeGenEvent(CLHEP::HepLorentzRotation& transform) const;
     /** apply boost to individual GenParticles */
-    void boostParticle(HepMC::GenParticlePtr  p, const CLHEP::HepLorentzRotation& transform) const;
+    void boostParticle(HepMC::GenParticlePtr p, const CLHEP::HepLorentzRotation& transform) const;
 
     ServiceHandle<IAthRNGSvc>       m_rndGenSvc;
     ATHRNG::RNGWrapper*             m_randomEngine;             //!< Slot-local RNG

Simulation/BeamEffects/src/GenEventRotator.h

@@ -4,10 +4,6 @@
   Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
 */
 
-///////////////////////////////////////////////////////////////////
-// GenEventRotator.h, (c) ATLAS Detector software
-///////////////////////////////////////////////////////////////////
-
 #ifndef ISF_HEPMC_GENEVENTROTATOR_H
 #define ISF_HEPMC_GENEVENTROTATOR_H 1