Revert "KGeoBag deinitialization (#92)"

This reverts commit c07cbb3 as discussed in #92 because it prevents the visualization with vtk after the simulation has ended.

Kassiopeia/Geometry/Source/KSGeoSpace.cxx

@@ -231,8 +231,6 @@ void KSGeoSpace::DeinitializeComponent()
     for (tGeoSideIt = fSides.begin(); tGeoSideIt != fSides.end(); tGeoSideIt++) {
         (*tGeoSideIt)->Deinitialize();
     }
-
-    KGeoBag::KGInterface::DeleteInstance();
 
     return;
 }