Fix event origin for wxEVT_CHAR from wxCompositeWindow children

Use the just added wxEventObjectOriginSetter to set the event object and
ID to that of wxCompositeWindow itself, rather than that of the child
window where the event had actually occurred.

include/wx/compositewin.h

@@ -223,6 +223,8 @@ private:
 
     void OnChar(wxKeyEvent& event)
     {
+        wxEventObjectOriginSetter setThis(event, this, this->GetId());
+
         if ( !this->ProcessWindowEvent(event) )
             event.Skip();
     }