Bug 1628818 [wpt PR 22827] - Update wpt metadata, a=testonly

wpt-pr: 22827
wpt-type: metadata

testing/web-platform/meta/event-timing/idlharness.any.js.ini

@@ -53,6 +53,9 @@
   [PerformanceEventTiming interface: operation toJSON()]
     expected: FAIL
 
+  [PerformanceEventTiming interface: attribute target]
+    expected: FAIL
+
 
 [idlharness.any.worker.html]