nixos-module/container/upstream: fix syntax

nix/nixos-module/container/upstream.nix

@@ -32,12 +32,15 @@ in
       };
     };
   } // builtins.mapAttrs (_: { upstream, ... }:
+    # DHCP
     lib.optionalAttrs (hostName != "flpk-gw") {
       DHCP = "yes";
       networkConfig.IPv6AcceptRA = true;
       dhcpV6Config.PrefixDelegationHint = "::/56";
-    } // {
-      # Traffic Shaping
+    }
+    //
+    # Traffic Shaping
+    {
       extraConfig = ''
         [CAKE]
         Parent = root
@@ -54,7 +57,7 @@ in
         ''}
       '';
     }
-  }) upstreamInterfaces;
+  ) upstreamInterfaces;
 
   networking.nat = lib.optionalAttrs enabled {
     enable = true;