Fix WP CLI when WPMM is active

We’ve been having some problems with WP CLI and WPMM and noticed that we were not the only ones:
https://wordpress.org/support/topic/allow-wp-cli-commands-to-run?replies=5

Until WPMM comes with an update you can fix it by putting this code into a small plugin.

if ( defined( 'WP_CLI' ) && WP_CLI ) {
	add_action('plugins_loaded', function() {
		remove_action('plugins_loaded', array('WP_Maintenance_Mode', 'get_instance'));
	}, 8 );
}

https://wordpress.org/plugins/wp-maintenance-mode/