wx: (hopefully) fixed a compilation error, reported by robux

modules/gui/wxwindows/messages.cpp

@@ -193,7 +193,7 @@ void Messages::UpdateLog()
 /*****************************************************************************
  * Private methods.
  *****************************************************************************/
-void Messages::OnClose( wxCommandEvent& WXUNUSED(event) )
+void Messages::OnClose( wxEvent& WXUNUSED(event) )
 {
     Hide();
 }

modules/gui/wxwindows/wxwindows.h

@@ -798,7 +798,7 @@ public:
 
 private:
     /* Event handlers (these functions should _not_ be virtual) */
-    void OnClose( wxCommandEvent& event );
+    void OnClose( wxEvent& event );
     void OnClear( wxCommandEvent& event );
     void OnSaveLog( wxCommandEvent& event );