[Gardening]: REGRESSION(268639@main): [ macOS wk2 ] fast/frames/ifram…

…e-window-focus.html is consistently failing.

rdar://118355231
https://bugs.webkit.org/show_bug.cgi?id=264773

Unreviewed test gardening.

Removing test expectation

* LayoutTests/platform/mac-wk2/TestExpectations:

Canonical link: https://commits.webkit.org/270718@main

LayoutTests/platform/mac-wk2/TestExpectations

@@ -1998,6 +1998,4 @@ webkit.org/b/264362 [ Sonoma+ ] fast/rendering/render-style-null-optgroup-crash.
 
 webkit.org/b/264751 fast/frames/iframe-window-focus.html [ Pass Failure ]
 
-webkit.org/b/264773 fast/box-shadow/inset-box-shadow.html [ ImageOnlyFailure ]
-
 webkit.org/b/264783 [ Monterey+ x86_64 ] http/wpt/mediarecorder/record-context-created-late.html [ Failure ]