Update modules/ROOT/examples/live-demos/comments-callback/index.js

Co-authored-by: tiny-ben-tran <ben.tran@tiny.cloud>

Author: kemister85

modules/ROOT/examples/live-demos/comments-callback/index.js

@@ -202,7 +202,6 @@ const tinycomments_lookup = (req, done) => {
 
 tinymce.init({
   selector: 'textarea#comments-callback',
-  license_key: 'gpl',
   height: 800,
   toolbar: 'addcomment showcomments code | bold italic underline',
   menubar: 'file edit view insert format tools tc help',