FIX: old gcode files don't show timelapse when send print

Change-Id: If1829c8848ab9874a55367cdf77f881be0645c10
(cherry picked from commit 95d456f4cc16840167b3e2beaee597208bc885b4)

src/slic3r/GUI/SelectMachine.hpp

@@ -398,6 +398,7 @@ protected:
     void                         reset_ams_material();
     void                         update_show_status();
     void                         update_ams_check(MachineObject* obj);
+    bool                         is_show_timelapse();
 
     wxTimer *m_refresh_timer { nullptr };