programs.zsh: remove unnecessary `with`

Changed files
+1 -1
nixos
modules
programs
+1 -1
nixos/modules/programs/zsh/oh-my-zsh.xml
···
<programlisting>
{ pkgs, ... }:
{
-
programs.zsh.ohMyZsh.customPkgs = with pkgs; [
+
programs.zsh.ohMyZsh.customPkgs = [
pkgs.nix-zsh-completions
# and even more...
];