fix "doc will be saved" dialog message

looks like a copy/paste error in
    commit 942f0599
    Author: Caolán McNamara <caolanm@redhat.com>
    convert remaining ErrorBox to weld::MessageDialog

Change-Id: I52d38311b1e276fd799128e058ea0b9c902aef06
Reviewed-on: https://gerrit.libreoffice.org/68491
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

sc/source/ui/docshell/docsh4.cxx

@@ -974,7 +974,7 @@ void ScDocShell::Execute( SfxRequest& rReq )
                             {
                                 std::unique_ptr<weld::MessageDialog> xQueryBox(Application::CreateMessageDialog(pWin ? pWin->GetFrameWeld() : nullptr,
                                                                                VclMessageType::Question, VclButtonsType::YesNo,
-                                                                               ScResId(STR_REIMPORT_AFTER_LOAD)));
+                                                                               ScResId(STR_DOC_WILLBESAVED)));
                                 xQueryBox->set_default_response(RET_YES);
                                 if (xQueryBox->run() == RET_NO)
                                 {