Add product images to WooCommerce order emails, also adds images to AutomateWoo order table

functions.php

<?php

/**
 * Add product images to the WooCommerce order table used in HTML emails. 
 */
add_filter( 'woocommerce_email_order_items_args', function( $args ) {
	$args['show_image'] = true;
	$args['image_size'] = array( 100, 100 );
	return $args;
}, 10, 1 );