wordpress: fix generate.sh

#!/usr/bin/env nix-shell

#! nix-shell -I nixpkgs=../../../../.. -i bash -p wp4nix

#!nix-shell -i bash -p wp4nix jq

set -e

set -u

set -o pipefail

set -x

cd $(dirname "$0")

nixFlags="--option experimental-features nix-command eval --raw --impure --expr"

export NIX_PATH=nixpkgs=../../../../..

export WP_VERSION=$(nix $nixFlags '(import <nixpkgs> {}).wordpress.version')

PLUGINS=`cat wordpress-plugins.json | jq -r '.[]' | sed -z 's/\n/,/g;s/,$/\n/'`