Bug 1673451 [wpt PR 26290] - Update wpt metadata, a=testonly

wpt-pr: 26290 wpt-type: metadata
2020-10-26 22:20:54 +00:00 · 2020-10-26 22:20:54 +00:00 · eeeeba9472
--- a/testing/web-platform/meta/webrtc-insertable-streams/RTCPeerConnection-insertable-streams-worker.https.html.ini
+++ b/testing/web-platform/meta/webrtc-insertable-streams/RTCPeerConnection-insertable-streams-worker.https.html.ini
@ -2,3 +2,6 @@
  [RTCRtpSender readable stream transferred to a Worker and the Worker sends an RTCEncodedVideoFrame back]
    expected: FAIL

+  [RTCRtpSender readable stream transferred to a Worker and the Worker sends an RTCEncodedAudioFrame back]
+    expected: FAIL
+