searxng/module.nix: fix nginx, cleanup

modules/services/searxng/module.nix

@@ -6,7 +6,7 @@
 }: let
   inherit (lib.options) mkEnableOption;
   inherit (lib.modules) mkIf;
-  inherit (lib.strings) toString;
+  inherit (builtins) toString;
   cfg = config.modules.services.searxng;
   port = 4021;
 in {
@@ -15,9 +15,8 @@ in {
   config = mkIf cfg.enable {
     networking.firewall.allowedTCPPorts = [port];
 
-    modules.system.services.nginx.enable = true;
-
     services = {
+      nginx.enable = true;
       searx = {
         enable = true;
         package = pkgs.searxng;
@@ -101,7 +100,7 @@ in {
           ];
         };
       };
-      nginx.virtualhosts."search.copeberg.org" = {
+      nginx.virtualHosts."search.copeberg.org" = {
         locations."/".proxyPass = "http://127.0.0.1:${toString port}";
         extraConfig = ''
           access_log /dev/null;