[Gardening]: [ Sonoma wk2 release ] fast/forms/listbox-padding-clip-s…

…elected.html is a flaky image failure

rdar://121275821
https://bugs.webkit.org/show_bug.cgi?id=267778

Unreviewed test gardening.

Adding test expectation

* LayoutTests/platform/mac-wk2/TestExpectations:

Canonical link: https://commits.webkit.org/273236@main

LayoutTests/platform/mac-wk2/TestExpectations

@@ -1965,3 +1965,5 @@ webkit.org/b/267384 [ Sonoma+ ] fast/selectors/text-field-selection-window-inact
 webkit.org/b/267655 [ Monterey Ventura Debug ] scrollingcoordinator/scrolling-tree/scroller-with-proxy-nodes-loses-layer.html [ Crash ]
 
 webkit.org/b/267670 [ Sonoma+ ] imported/w3c/web-platform-tests/css/css-position/fixed-z-index-blend.html [ Pass ImageOnlyFailure ]
+
+webkit.org/b/267778 [ Sonoma+ Release ] fast/forms/listbox-padding-clip-selected.html [  Pass ImageOnlyFailure ]