message: fix more private field accesses in tests
diff: @@ -30,9 +30,7 @@ function createFailedDecryptionEvent() {
  const event = new MatrixEvent({
  event_id: "event-id-" + Math.random().toString(16).slice(2),
  });
  - event._setClearData(
  - event._badEncryptedMessage(":("),
  - );
  + event.setClearData(event.badEncryptedMessage(":("));
  return event;
  }
  @@ -67,7 +65,7 @@ describe('DecryptionFailureTracker', function() {
  tracker.eventDecrypted(decryptedEvent, err);
  // Indicate successful decryption: clear data can be anything where the msgtype is not m.bad.encrypted
  - decryptedEvent._setClearData({});
  + decryptedEvent.setClearData({});
  tracker.eventDecrypted(decryptedEvent, null);
  // Pretend "now" is Infinity
  