Bug 1724557 - skip test browser_media_wakelock.js again on Apple Silicon for intermittent failures. DONTBUILD

`skip` condition got removed in bug 1726309 but test is not as stable as
expected.

Differential Revision: https://phabricator.services.mozilla.com/D123347

toolkit/content/tests/browser/browser.ini

@@ -113,6 +113,7 @@ support-files =
   gizmo-noaudio.webm
 skip-if =
   (os == "win" && processor == "aarch64") # aarch64 due to 1536573
+  apple_silicon # bug 1724557
 [browser_media_wakelock_PIP.js]
 support-files =
   file_video.html