Remove duplicated includes

Change-Id: I0798bce1234d917da78ee973055d8e7556d95e78
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/200627
Tested-by: Jenkins
Reviewed-by: David Gilbert <freedesktop@treblig.org>

oox/source/drawingml/diagram/diagram.cxx

@@ -55,8 +55,6 @@
 #ifdef DBG_UTIL
 #include <osl/file.hxx>
 #include <o3tl/environment.hxx>
-#include <tools/stream.hxx>
-#include <unotools/streamwrap.hxx>
 #include <comphelper/storagehelper.hxx>
 #include <com/sun/star/embed/XRelationshipAccess.hpp>
 #endif