Bug 1483012 [wpt PR 12435] - Update wpt metadata, a=testonly

wpt-pr: 12435
wpt-type: metadata

testing/web-platform/meta/uievents/idlharness.window.js.ini

@@ -0,0 +1,7 @@
+[idlharness.window.html]
+  [InputEvent interface: attribute data]
+    expected: FAIL
+
+  [InputEvent interface: new InputEvent("event") must inherit property "data" with the proper type]
+    expected: FAIL
+