forgejo/openssh: listen on all interfaces

this doesn't help us with anything yet, but it does at least mean that
this openssh now also listens on IPv6, which it didn't before.

(reaching the container from the outside still does not work)

parsons/forgejo.nix

@@ -67,10 +67,6 @@
       };
       services.openssh = {
         enable = true;
-        listenAddresses = [ {
-          addr = config.containers.forgejo.localAddress;
-          port = 22;
-        } ];
         settings = {
           PasswordAuthentication = false;
           AcceptEnv = "GIT_PROTOCOL";