nixos/tests/letsencrypt: Fix nginx options

The enableSSL option has been deprecated in
a912a6a291, so we switch to using onlySSL.

I've also explicitly disabled enableACME, because this is the default
and we don't actually want to have ACME enabled for a host which runs an
actual ACME server.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

nixos/tests/common/letsencrypt.nix

@@ -371,13 +371,15 @@ in {
     services.nginx.enable = true;
     services.nginx.recommendedProxySettings = true;
     services.nginx.virtualHosts.${wfeDomain} = {
-      enableSSL = true;
+      onlySSL = true;
+      enableACME = false;
       sslCertificate = wfeCertFile;
       sslCertificateKey = wfeKeyFile;
       locations."/".proxyPass = "http://127.0.0.1:80";
     };
     services.nginx.virtualHosts.${siteDomain} = {
-      enableSSL = true;
+      onlySSL = true;
+      enableACME = false;
       sslCertificate = siteCertFile;
       sslCertificateKey = siteKeyFile;
       locations.${tosPath}.extraConfig = "alias ${tosFile};";