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/MultiMachinePage.hpp

@@ -41,7 +41,7 @@ public:
 
     void init_tabpanel();
     void init_timer();
-    void on_timer();
+    void on_timer(wxTimerEvent& event);
 
     void clear_page();
 };