Bug 1387534 - Update test metadata to reflect the fact it fails on all OSX builds, a=testonly

MozReview-Commit-ID: 4vOGDMIMN26

testing/web-platform/meta/css-paint-api/parse-input-arguments-018.html.ini

@@ -1,5 +1,4 @@
 [parse-input-arguments-018.html]
   type: reftest
   expected:
-    if not debug and not stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): FAIL
-    if debug and not stylo and e10s and (os == "mac") and (version == "OS X 10.10.5") and (processor == "x86_64") and (bits == 64): FAIL
+    if (os == "mac"): FAIL