fix: cross-origin iframe platform test (#672)

Author: quickshiftin

tests/platform/iframe/cross-origin.html docs/public/cross-origin.htmltests/platform/iframe/cross-origin.html renamed to docs/public/cross-origin.html

@@ -328,7 +328,7 @@ <h1>Iframe</h1>
 
             iframe.style.height = '45px';
 
-            const url = new URL('https://partytown.qwik.dev/tests/platform/iframe/cross-origin.html');
+            const url = new URL('https://partytown.qwik.dev/cross-origin.html');
             url.searchParams.set('parentorigin', window.origin);
             iframe.src = url.href;
             elm.parentNode.appendChild(iframe);