Custom control : Fixed un-hovering for labels, which work as a hyperlinks

src/slic3r/GUI/OG_CustomCtrl.hpp

@@ -78,6 +78,7 @@ public:
     void    OnPaint(wxPaintEvent&);
     void    OnMotion(wxMouseEvent& event);
     void    OnLeftDown(wxMouseEvent& event);
+    void    OnLeaveWin(wxMouseEvent& event);
 
     void    init_ctrl_lines();
     bool    update_visibility(ConfigOptionMode mode);