WooCommerce 3.2: Add resend admin order email option that was removed

functions.php

<?php
/**
 * This adds back an option to resend the admin new order email from the order edit screen that was removed in WooCommerce 3.2
 */

/**
 * Filter to add a new menu to the dropdown
 *
 * @param array $actions
 * @return array
 */
function add_resend_admin_order_email_action( $actions ) {
	$actions['send_admin_order_details'] = __( 'Email order details to Admin', 'woocommerce' );
	return $actions;
}
add_filter( 'woocommerce_order_actions', 'add_resend_admin_order_email_action', 10, 1 );

/**
 * Hook into newly added send_admin_order_details to handle sending of admin emails
 *
 * @param $order Order object
 * @return void
 */
function resend_send_admin_order_email( $order ) {
	// Send the admin new order email.
	WC()->payment_gateways();
	WC()->shipping();
	WC()->mailer()->emails['WC_Email_New_Order']->trigger( $order->get_id(), $order );

	// Note the event.
	$order->add_order_note( __( 'Order details manually sent to admin.', 'woocommerce' ), false, true );

	do_action( 'woocommerce_after_resend_order_email', $order, 'new_order' );

	// Change the post saved message.
	add_filter( 'redirect_post_location', array( 'WC_Meta_Box_Order_Actions', 'set_email_sent_message' ) );
}
add_action( 'woocommerce_order_action_send_admin_order_details', 'resend_send_admin_order_email', 10, 1 );