Bug 1560753 - update appearance-auto-001.html expectations r=gbrown

Differential Revision: https://phabricator.services.mozilla.com/D47692

--HG--
extra : moz-landing-system : lando

testing/web-platform/meta/css/css-ui/appearance-auto-001.html.ini

@@ -3,5 +3,5 @@
     if debug and (os == "win") and (version == "6.1.7601"): https://bugzilla.mozilla.org/show_bug.cgi?id=1560360
   expected:
     if (os == "win") and (processor == "x86"): FAIL
-    if (os == "win") and (processor == "x86_64"): FAIL
+    if (os == "win") and (processor == "x86_64"): ["FAIL", "PASS"]
     if (os == "win") and (processor == "aarch64"): ["FAIL", "PASS"]