nixos-option: move default nixos argument to shell script

{

  nixos ? import <nixpkgs/nixos> { },

  nixos,

  # list representing a nixos option path (e.g. ['console' 'enable']), or a

  # prefix of such a path (e.g. ['console']), or a string representing the same

  # (e.g. 'console.enable')

  path,

  # whether to recurse down the config attrset and show each set value instead

  recursive ? false,

  recursive,

}:

let

recursive=false

no_flake=false

positional_args=()

nix_args=()

nix_args=(--arg nixos "import <nixpkgs/nixos> { }")

flake=""

while [[ $# -gt 0 ]]; do