Bug 1632172 [wpt PR 23169] - Update wpt metadata, a=testonly

wpt-pr: 23169
wpt-type: metadata

testing/web-platform/meta/css/css-properties-values-api/at-property.html.ini

@@ -128,6 +128,9 @@
   [Rule applied [<url>, url("http://a/"), false\]]
     expected: FAIL
 
+  [Initial value may be omitted for universal registration]
+    expected: FAIL
+
   [Rule applied [<color>, tomato, true\]]
     expected: FAIL