SetMaxOutgoingBitrate does not work if set before first consumer created

[penguinol]

mediasoup/worker/src/RTC/Transport.cpp

Lines 633 to 646 in f147f77

	if (this->tccClient)
	{
	uint32_t bitrate = jsonBitrateIt->get<uint32_t>();
	// NOTE: This may throw if given bitrate is less than current
	// initialAvailableOutgoingBitrate, so don't update things before
	// calling this method.
	this->tccClient->SetMaxOutgoingBitrate(bitrate);
	this->maxOutgoingBitrate = bitrate;
	MS_DEBUG_TAG(bwe, "maximum outgoing bitrate set to %" PRIu32, this->maxOutgoingBitrate);
	ComputeOutgoingDesiredBitrate();
	}

According to current code, the max outgoing bitrate will be set only when tccClient is created.
And set max incoming bitrate has not this limitation

mediasoup/worker/src/RTC/Transport.cpp

Lines 593 to 617 in f147f77

	case Channel::ChannelRequest::MethodId::TRANSPORT_SET_MAX_INCOMING_BITRATE:
	{
	auto jsonBitrateIt = request->data.find("bitrate");
	// clang-format off
	if (
	jsonBitrateIt == request->data.end() ||
	!Utils::Json::IsPositiveInteger(*jsonBitrateIt)
	)
	// clang-format on
	{
	MS_THROW_TYPE_ERROR("missing bitrate");
	}
	this->maxIncomingBitrate = jsonBitrateIt->get<uint32_t>();
	MS_DEBUG_TAG(bwe, "maximum incoming bitrate set to %" PRIu32, this->maxIncomingBitrate);
	request->Accept();
	if (this->tccServer)
	this->tccServer->SetMaxIncomingBitrate(this->maxIncomingBitrate);
	break;
	}

I think it's because we want to validate the max bitrate in tccClient->SetMaxOutgoingBitrate.

[ibc]

@penguinol see PR #833