Bug 1507325 [wpt PR 14060] - Update wpt metadata, a=testonly

wpt-pr: 14060
wpt-type: metadata

testing/web-platform/meta/background-fetch/fetch.https.window.js.ini

@@ -47,3 +47,6 @@
   [Matching to a non-existing request should work]
     expected: FAIL
 
+  [Matching multiple times on the same request works as expected.]
+    expected: FAIL
+