Imported css3-counter-styles-138.html is a constant failure

https://bugs.webkit.org/show_bug.cgi?id=245592
rdar://100333890

Reviewed by Tim Nguyen.

Allowing some tolerance for test.

* LayoutTests/imported/w3c/web-platform-tests/css/css-counter-styles/mongolian/css3-counter-styles-138.html:
* LayoutTests/platform/ios-wk2/TestExpectations:

Canonical link: https://commits.webkit.org/256446@main

LayoutTests/imported/w3c/web-platform-tests/css/css-counter-styles/mongolian/css3-counter-styles-138.html

@@ -7,6 +7,7 @@
 <link rel='help' href='http://www.w3.org/TR/css-counter-styles-3/#simple-numeric'>
 <link rel='match' href='css3-counter-styles-138-ref.html'>
 <meta name="assert" content="list-style-type: mongolian produces numbers after 9 per the spec.">
+<meta name=fuzzy content="maxDifference=0-255;totalPixels=0-240">
 <style type='text/css'>
 ol li { list-style-type: mongolian;  }
 /* the following CSS is not part of the test */

LayoutTests/platform/ios-wk2/TestExpectations

@@ -2372,8 +2372,6 @@ imported/w3c/web-platform-tests/html/canvas/element/manual/imagebitmap/createIma
 webkit.org/b/245588 mathml/presentation/mathvariant-inheritance.html [ ImageOnlyFailure ]
 webkit.org/b/245588 mathml/presentation/fenced-mi.html [ ImageOnlyFailure ]
 
-webkit.org/b/245592 imported/w3c/web-platform-tests/css/css-counter-styles/mongolian/css3-counter-styles-138.html [ ImageOnlyFailure ]
-
 webkit.org/b/245595 imported/blink/svg/canvas/canvas-draw-pattern-size.html [ ImageOnlyFailure ]
 
 webkit.org/b/245600 fast/attachment/attachment-wrapping-action.html [ ImageOnlyFailure ]