services/searxng: quote bind address

services/searxng.nix

@@ -41,7 +41,7 @@ in
         };
         server = {
           port = searxngPort;
-          bind_address = 127.0 .0 .1;
+          bind_address = "127.0.0.1";
           base_url = "app-01.tail755c5.ts.net/search/";
           public_instance = false;
           method = "POST";