xcb_ewmh_set_number_of_desktops

@brief Send a ChangeProperty request for _NET_NUMBER_OF_DESKTOPS

_NET_NUMBER_OF_DESKTOPS? CARDINAL/32

@param ewmh The per-screen EWMH information @param screen_nbr The screen number @param number_of_desktops The number of desktops @return Cookie associated with the ChangeProperty _NET_NUMBER_OF_DESKTOPS request