[ macOS Debug EWS ] compositing/backing/backing-store-attachment-anim…

…ating-outside-viewport.html is a flaky failure

https://bugs.webkit.org/show_bug.cgi?id=246467

Unreviewed test gardening.

Applying expectation to more than just Debug queues to stop it from negativly impacting merge-queue.

* LayoutTests/platform/mac/TestExpectations:

Canonical link: https://commits.webkit.org/255544@main

LayoutTests/platform/mac/TestExpectations

@@ -2381,7 +2381,7 @@ webkit.org/b/245994 imported/w3c/web-platform-tests/streams/readable-byte-stream
 
 webkit.org/b/246427 [ Debug ] imported/w3c/web-platform-tests/preload/preload-referrer-policy.html [ Pass Failure ]
 
-webkit.org/b/246467 [ Debug ] compositing/backing/backing-store-attachment-animating-outside-viewport.html [ Pass Failure ]
+webkit.org/b/246467 compositing/backing/backing-store-attachment-animating-outside-viewport.html [ Pass Failure ]
 
 # webkit.org/b/243681  Newly imported tests that fail on BigSur+
 [ BigSur+ Debug ] imported/w3c/web-platform-tests/IndexedDB/structured-clone.any.html?101-last [ Failure ]