[text-decorations] Update fuzzy for `text-decoration-subelements-002.html`

The `text-decoration-subelements-002.html` passes on the Blink
test runner, but fails on the wpt test runner[1] due to
different anti-aliasing. The result page[2] shows:
  maxDifference: 80
  totalPixels: 39
This patch updates the fuzzy for the wpt test runner.

Increasing `maxDifference` to 80 should make wpt test runner
to pass, but it causes failure on mac-rel. This is likely an
issue in Blink test runner <crbug.com/1343220> because
increasing it should not cause any failures according to the
Fuzzy Match spec[3].

[1] https://wpt.fyi/results/css/css-text-decor/text-decoration-subelements-002.html?label=master&label=experimental&product=chrome&product=firefox&product=safari&aligned&q=text-decor
[2] https://wpt.fyi/analyzer?screenshot=sha1%3A0260620a40d7b5f59dcb6de176d0bc9252ed96b1&screenshot=sha1%3A96f1ebac92381fe15e49b09de8c5f0df9a22be1d
[3] https://web-platform-tests.org/writing-tests/reftests.html#fuzzy-matching

Bug: 1008951
Change-Id: Idc4b55803570b27f578871d0b084098df221e993
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3748547
Commit-Queue: Kent Tamura <tkent@chromium.org>
Auto-Submit: Koji Ishii <kojii@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1022531}
diff --git a/css/css-text-decor/text-decoration-subelements-002.html b/css/css-text-decor/text-decoration-subelements-002.html
index 8ac1afa..c8eeea6 100644
--- a/css/css-text-decor/text-decoration-subelements-002.html
+++ b/css/css-text-decor/text-decoration-subelements-002.html
@@ -8,7 +8,7 @@
     <link rel="author" title="Mozilla" href="https://www.mozilla.org">
     <link rel="help" href="https://drafts.csswg.org/css-text-decor-3/#text-underline-position-property">
     <link rel="match" href="reference/text-decoration-subelements-002-ref.html">
-    <meta name="fuzzy" content="maxDifference=75;totalPixels=42">
+    <meta name="fuzzy" content="maxDifference=80;totalPixels=42">
     <style>
       div.wrapper {
         font-size: 2em;