Bug 1505173 [wpt PR 13955] - Update wpt metadata, a=testonly

wpt-pr: 13955
wpt-type: metadata

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

@@ -8,3 +8,6 @@
   [Background Fetch without updateUI resolves]
     expected: FAIL
 
+  [Background Fetch updateUI fails when event is not active]
+    expected: FAIL
+