fix typo

common/server/icecast.nix

@@ -11,6 +11,7 @@ in {
   };
 
   config = lib.mkIf cfg.enable {
+    services.icecast = {
       listen.address = "127.0.0.1";
       admin.password = "hackme";
       extraConf = ''
@@ -36,4 +37,5 @@ in {
         proxyPass = "http://localhost:${toString cfg.listen.port}/${cfg.mount}";
       };
     };
+  };
 }