feat(system): remove sshfs

honestly, not sure why this was ever here.
probably just carried over from a drastically different place

defaults/system.nix

@@ -1,5 +1,4 @@
 {
-  pkgs,
   lib,
   config,
   ...
@@ -12,19 +11,10 @@ in
 {
   options.nixowos.defaults.${name} = {
     enable = lib.mkEnableOption name;
-
-    extraPackages = lib.mkOption {
-      type = lib.types.listOf lib.types.package;
-      default = with pkgs; [
-        sshfs
-      ];
-    };
   };
 
   config = lib.mkIf cfg.enable {
 
-    environment.systemPackages = lib.mkIf config.nixowos.allowAddingPackages cfg.extraPackages;
-
     boot.loader.grub = lib.mkDefault {
       # modern installation
       device = "nodev";