tdf#120271 related: Allow finalizing of LastTimeGetInvolvedShown

This avoids abort() on modifying the setting in case it's finalized

Change-Id: I5982a4d7bf867301d7ba0e7e0dbb3f7c87013134
Reviewed-on: https://gerrit.libreoffice.org/61430
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

sfx2/source/view/viewfrm.cxx

@@ -1237,7 +1237,8 @@ void SfxViewFrame::Notify( SfxBroadcaster& /*rBC*/, const SfxHint& rHint )
                     pInfoBar->addButton(xGetInvolvedButton);
                 }
 
-                if (bUpdateLastTimeGetInvolvedShown)
+                if (bUpdateLastTimeGetInvolvedShown
+                    && !officecfg::Setup::Product::LastTimeGetInvolvedShown::isReadOnly())
                 {
                     std::shared_ptr<comphelper::ConfigurationChanges> batch(comphelper::ConfigurationChanges::create());
                     officecfg::Setup::Product::LastTimeGetInvolvedShown::set(nNow, batch);