Ignore decoration when updating focused window in PointerInput and TouchInput
Currently, it's possible to have the case where the pointer input device handler or the touch input device handler thinks that there's a focused window, but the corresponding focused surface in wayland seat is unset, because the pointer hovers the server side decoration.
If the server side decoration is destroyed, the input device handler will fail to update wayland seat's focused surface.
In order to make pointer input device handler and touch input device handler code more intuitive, this change makes focusUpdate() functions ignore the decoration.