containers(wine): simplify networking

It turns out that having to do the `nat` shenanigans is no longer
necessary or was never necessary to begin with.

In either case, the simplified result is much easier to work with
due to no dependency on the localAddress.

containers/wine.nix

@@ -9,7 +9,7 @@
 let
   inherit (nix-config.inputs.sakaya.packages.${pkgs.system}) sakaya;
   inherit (config.modules.system) username;
-  inherit (lib) singleton getExe;
+  inherit (lib) getExe;
 
   sakayaPort = 39493;
 in
@@ -66,14 +66,7 @@ in
 
   hardware.graphics.enable = true;
 
-  networking = {
-    nat.forwardPorts = singleton {
-      destination = "192.168.100.49:${sakayaPort}";
-      sourcePort = sakayaPort;
-    };
-
-    firewall.allowedTCPPorts = [ sakayaPort ];
-  };
+  networking.firewall.allowedTCPPorts = [ sakayaPort ];
 
   systemd.services.sakaya = {
     enable = true;