Accept both HTTP and HTTPS connection instead of only HTTPS

nixos/modules/monitoring/server/grafana.nix

@@ -112,7 +112,7 @@ in {
 
       virtualHosts.${config.services.grafana.domain} = {
         enableACME = true;
-        onlySSL = true;
+        forceSSL = true;
         locations."/" = {
           proxyPass = "http://127.0.0.1:${toString config.services.grafana.port}";
           proxyWebsockets = true;
@@ -121,4 +121,3 @@ in {
     };
   };
 }
-