Fix Overview tile config

.. because the config widget is created before the tile
   configuration is loaded it needs to be updated before
   being shown to the user.

Fixes #4001.

src/Charts/OverviewItems.h

@@ -75,6 +75,11 @@ class OverviewItemConfig : public QWidget
         // legacy data table selector (connected to legacySelector below)
         void setProgram(int n);
 
+    protected:
+
+        // before show, lets make sure the widgets are set correctly
+        void showEvent(QShowEvent *) override { setWidgets(); }
+
     private:
 
         // the widget we are configuring