chore: upgrade tests to current standards in palindrome checker lab (freeCodeCamp#59843)

Author: majestic-owl448

curriculum/challenges/english/25-front-end-development/lab-palindrome-checker/657bdc55a322aae1eac3838f.md

@@ -54,7 +54,7 @@ You should have a `div`, `span`, or `p` element with an `id` of `"result"`.
 
 ```js
 const el = document.getElementById('result');
-assert(['div', 'span', 'p'].includes(el?.nodeName?.toLowerCase()));
+assert.oneOf(el?.nodeName?.toLowerCase(), ['div', 'span', 'p']);
 ```
 
 When you click on the `#check-btn` element without entering a value into the `#text-input` element, an alert should appear with the text `Please input a value`.