changed define to reflect filename

[[Imported from SVN: r485]]

istl/owneroverlapcopy.hh

 // -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 // vi: set et ts=4 sw=2 sts=2:
 // $Id$
-#ifndef DUNE_OWNERCOPY_HH
-#define DUNE_OWNERCOPY_HH
+#ifndef DUNE_OWNEROVERLAPCOPY_HH
+#define DUNE_OWNEROVERLAPCOPY_HH
 
 #include <new>
 #include <iostream>