Update fuzzy match tolerance for composited-filters-under-opacity.html

Increases the allowed maxDifference from 1 to 2 (test page #7f7ff7 vs
ref page #8080f7).

Change-Id: Ib69e7100bdc399a8146c49bada54c9e837906186
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/8163381
Auto-Submit: Keren Zhu <kerenzhu@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1669616}

Author: naeioi

css/css-color/composited-filters-under-opacity.html

@@ -1,6 +1,6 @@
 <link rel="help" href="http://www.w3.org/TR/css3-color/#transparency">
 <link rel="match" href="composited-filters-under-opacity-ref.html">
-<meta name="fuzzy" content="maxDifference=0-1;totalPixels=0-22500">
+<meta name="fuzzy" content="maxDifference=0-2;totalPixels=0-22500">
 <style>
 div {
   position: absolute;