fix(nixos): keep timeout scoped to SteamCMD services

src/dotfiles/guests.nix

@@ -223,7 +223,6 @@ let
             wants = [ bridgeDevice ];
 
             serviceConfig = lib.filterAttrs (_: v: v != null) {
-              TimeoutStartSec = lib.mkForce "10min";
               MemoryMax = cfg.limits.memory;
               CPUQuota = cfg.limits.cpu;
               TasksMax = cfg.limits.tasksMax;