Revert "Fix Compile Warnings (#5963)"

This reverts commit b83e16dbdd.

Found regressions like auto orientation didn't work anymore after this change, revert it

src/slic3r/GUI/MultiMachineManagerPage.hpp

@@ -55,7 +55,7 @@ public:
 
     void start_timer();
     void update_page_number();
-    void on_timer();
+    void on_timer(wxTimerEvent& event);
     void clear_page();
 
     void page_num_enter_evt();