Remove duplicated include

About commit 34f7e618

Change-Id: I9142116305dc2cf2ecae66835facadee56ac836a
Reviewed-on: https://gerrit.libreoffice.org/37214Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>

sfx2/source/bastyp/frmhtmlw.cxx

@@ -48,7 +48,6 @@
 #include <rtl/bootstrap.hxx>
 #include <rtl/strbuf.hxx>
 #include <sax/tools/converter.hxx>
-#include "strings.hxx"
 
 using namespace ::com::sun::star;