Close menu on click if outside the menu.

I think, haven't tested.

openbox/event.c

@@ -1011,6 +1011,10 @@ static void event_handle_menu(ObClient *client, XEvent *e)
             }
         }
 
+        /* will call the menu_hide() for each submenu as well */
+        if (!it)
+            menu_hide(menu_visible->data);
+	
         break;
     case MotionNotify:
         ob_debug("motion\n");