nixos: services: remove redundant subdomains

See previous commit for the defaults.

modules/nixos/services/woodpecker/server/default.nix

@@ -54,12 +54,10 @@ in
 
     my.services.nginx.virtualHosts = {
       woodpecker = {
-        subdomain = "woodpecker";
         inherit (cfg) port;
       };
       # I might want to be able to RPC from other hosts in the future
       woodpecker-rpc = {
-        subdomain = "woodpecker-rpc";
         port = cfg.rpcPort;
       };
     };