Use default cipher list

nixos/modules/issuer.nix

@@ -199,9 +199,6 @@ in {
       recommendedProxySettings = true;
       recommendedTlsSettings = true;
 
-      # Only allow PFS-enabled ciphers with AES256:
-      sslCiphers = "AES256+EECDH:AES256+EDH:!aNULL";
-
       virtualHosts."${domain}" = {
         serverAliases = builtins.tail cfg.domains;
         enableACME = cfg.tls;