bugfix(ajax): permission check

tests/codeception/tests/integration/AjaxHandlerTest.php

@@ -91,6 +91,7 @@ class AjaxHandlerTest extends WPTestCase {
 	}
 
     public function testShoulfNotProcessAjaxNoticeDismissWhenInvalidNonce() {
+        defince( 'DOING_AJAX', true );
         $_POST[ AjaxHandler::POST_FIELD_NOTICE_NAME ] = self::NOTICE_NAME;
         $_POST[ AjaxHandler::POST_FIELD_SECURITY ] = wp_create_nonce();