StartUndo with END arg should have been EndUndo

Change-Id: Iffcb770ef0ebf28e6bdbea044cd0ec8dcffa53e8
Reviewed-on: https://gerrit.libreoffice.org/60804
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sw/source/uibase/shells/txtattr.cxx

@@ -490,7 +490,7 @@ void SwTextShell::ExecParaAttrArgs(SfxRequest &rReq)
                             rSh.ReplaceDropText(static_cast<const SfxStringItem*>(pItem)->GetValue());
                     }
                     rSh.SetAttrSet(*pDlg->GetOutputItemSet());
-                    rSh.StartUndo( SwUndoId::END );
+                    rSh.EndUndo( SwUndoId::END );
                     rSh.EndAction();
                     rReq.Done(*pDlg->GetOutputItemSet());
                 }