Bug 1492908 [wpt PR 13122] - Update wpt metadata, a=testonly

wpt-pr: 13122
wpt-type: metadata

testing/web-platform/meta/html/semantics/embedded-content/the-img-element/img.complete.html.ini

@@ -2,3 +2,6 @@
   [IDL attribute complete returns true when image resource has been fetched but not run yet & image is not in broken state]
     expected: FAIL
 
+  [async srcset complete test]
+    expected: FAIL
+