fix: Expose GLightbox as lhGlightbox to window (#440)

Author: ckanitz

plugin/src/js/lightbox.js

@@ -1,5 +1,7 @@
 import GLightbox from 'glightbox';
 
+window.lhGlightbox = window?.lhGlightbox ?? GLightbox;
+
 document.addEventListener('DOMContentLoaded', () => {
 	new LightboxControl();
 });