Updates the network-wide users count.

If enabled through the {@see ‘enable_live_network_counts’} filter, update the users count
on a network when a user is created or its status is updated.

function wp_maybe_update_network_user_counts( $network_id = null ) {
	$is_small_network = ! wp_is_large_network( 'users', $network_id );

	/** This filter is documented in wp-includes/ms-functions.php */
	if ( ! apply_filters( 'enable_live_network_counts', $is_small_network, 'users' ) ) {
		return;
	}

	wp_update_network_user_counts( $network_id );
}