feature(ajax): added nonce

assets/js/notice.js

 jQuery( document ).on( 'click', '.notice-dismiss', function() {
-    var notice_name = jQuery(this).closest('div.notice').data('notice-name');
-    var source = jQuery(this).closest('div.notice').data('source');
+    const $notice_div= jQuery(this).closest('div.notice');
+    const notice_name = $notice_div.data('notice-name');
+    const source = $notice_div.data('source');
+    const security = $notice_div.data('security');
     if ('' !== notice_name) {
         jQuery.ajax({
             url: ajaxurl,
             type: 'post',
             data: {
+                security: security,
                 action: 'wpdesk_notice_dismiss',
                 notice_name: notice_name,
                 source: source,