call present after returning from shrunken mode

Change-Id: Ib286741cc86ec38bd9e32e809f33c3f283ee6d7a
Reviewed-on: https://gerrit.libreoffice.org/71828
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/unx/gtk3/gtk3gtkinst.cxx

@@ -3153,6 +3153,7 @@ public:
         if (GtkWidget* pActionArea = gtk_dialog_get_action_area(m_pDialog))
             gtk_widget_show(pActionArea);
         resize_to_request();
+        present();
     }
 
     virtual void SetInstallLOKNotifierHdl(const Link<void*, vcl::ILibreOfficeKitNotifier*>&) override