Add PR #228: New configure town zone multipliers

src/settings.cpp

@@ -1298,6 +1298,12 @@ static bool ZoomMinMaxChanged(int32 p1)
 	return true;
 }
 
+static bool InvalidateSettingsWindow(int32 p1)
+{
+	InvalidateWindowClassesData(WC_GAME_OPTIONS);
+	return true;
+}
+
 /**
  * Update any possible saveload window and delete any newgrf dialogue as
  * its widget parts might change. Reinit all windows as it allows access to the