Removed duplicated include

Change-Id: Id17744f8c2d48a04e1b5e64a11739605709fb6c3
Reviewed-on: https://gerrit.libreoffice.org/41865
Reviewed-by: Tamás Zolnai <tamas.zolnai@collabora.com>
Tested-by: Tamás Zolnai <tamas.zolnai@collabora.com>
diff --git a/cui/source/dialogs/insdlg.cxx b/cui/source/dialogs/insdlg.cxx
index 60d4468..0bb974c 100644
--- a/cui/source/dialogs/insdlg.cxx
+++ b/cui/source/dialogs/insdlg.cxx
@@ -51,7 +51,6 @@
#include <sfx2/filedlghelper.hxx>
#include <sfx2/frmdescr.hxx>
#include <sfx2/viewsh.hxx>
#include <sfx2/filedlghelper.hxx>
#include <svl/ownlist.hxx>
#include <comphelper/seqstream.hxx>