Default site configured for 444 returns 404

[Steinar Bang]

Improved 444 configuration: replaced the letsencrypt certificate (which
won't work here anyway) with the self signed certificates bundled with
nginx (the more broken, the merrier in this case... confuse the bots!):

server {
        listen 80 default_server;
        listen [::]:80 default_server;
        listen 443 ssl default_server;
        listen [::]:443 ssl default_server;
        include snippets/snakeoil.conf;

        server_name _;

        return 444;
}