Removed duplicated include

Change-Id: Ib352e8cfac2e01b17dc22776cb45b5ba81e5875a
Reviewed-on: https://gerrit.libreoffice.org/38912Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
Tested-by: Julien Nabet <serval2412@yahoo.fr>

sw/source/filter/ww8/rtfsdrexport.cxx

@@ -33,7 +33,6 @@
 #include <textboxhelper.hxx>
 #include <dcontact.hxx>
 #include <algorithm>
-#include <filter/msfilter/rtfutil.hxx>
 
 using namespace css;