missing dialog parent for restart for language change

Change-Id: I3f04519ad3fe35bcaa040934547d5b206184efbd
Reviewed-on: https://gerrit.libreoffice.org/53039Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

cui/source/options/optgdlg.cxx

@@ -1382,7 +1382,7 @@ bool OfaLanguagesTabPage::FillItemSet( SfxItemSet* rSet )
             // display info
             SolarMutexGuard aGuard;
             svtools::executeRestartDialog(
-                comphelper::getProcessComponentContext(), nullptr,
+                comphelper::getProcessComponentContext(), GetFrameWeld(),
                 svtools::RESTART_REASON_LANGUAGE_CHANGE);
 
             // tell quickstarter to stop being a veto listener