nixos/zfs: Add defaultText for 'boot.zfs.package'-option (#122002)

Changed files
+1
nixos
modules
tasks
filesystems
+1
nixos/modules/tasks/filesystems/zfs.nix
···
readOnly = true;
type = types.package;
default = if config.boot.zfs.enableUnstable then pkgs.zfsUnstable else pkgs.zfs;
+
defaultText = "if config.boot.zfs.enableUnstable then pkgs.zfsUnstable else pkgs.zfs";
description = "Configured ZFS userland tools package.";
};