Fix typo and include in the GeoOpticalPhysVol.cxx file

GeoMaterial2G4/src/GeoOpticalPhysVol.cxx

-*
+/*
   Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
 */
 
-#include "GeoModelUtilities/GeoOpticalPhysVol.h"
+#include "GeoMaterial2G4/GeoOpticalPhysVol.h"
 
 GeoOpticalPhysVol::GeoOpticalPhysVol(const GeoLogVol* LogVol):
   GeoPhysVol(LogVol)