message: Fix bad quality filter behaviour with VP9 SVC
diff: @@ -130,7 +130,7 @@ void QualityFilterHandler::write(Context *ctx, std::shared_ptr<dataPacket> packe
  uint32_t ssrc = rtp_header->getSSRC();
  uint16_t sequence_number = rtp_header->getSeqNumber();
  - if (ssrc != last_ssrc_received_) {
  + if (last_ssrc_received_ != 0 && ssrc != last_ssrc_received_) {
  receiving_multiple_ssrc_ = true;
  }
  