fix(modal-checkout): require change payment class (#2257)

Author: miguelpeixe

newspack-blocks.php

@@ -22,6 +22,7 @@
 require_once NEWSPACK_BLOCKS__PLUGIN_DIR . 'includes/class-newspack-blocks-patterns.php';
 require_once NEWSPACK_BLOCKS__PLUGIN_DIR . 'includes/class-newspack-blocks-caching.php';
 require_once NEWSPACK_BLOCKS__PLUGIN_DIR . 'includes/modal-checkout/class-checkout-data.php';
+require_once NEWSPACK_BLOCKS__PLUGIN_DIR . 'includes/modal-checkout/class-change-payment-gateway.php';
 require_once NEWSPACK_BLOCKS__PLUGIN_DIR . 'includes/class-modal-checkout.php';
 
 require_once NEWSPACK_BLOCKS__PLUGIN_DIR . 'includes/plugins/class-the-events-calendar.php';