Errors not being handled during ChannelManager::accept_inbound_channel

[wvanlint]

We've heard about inbound channel requests stalling on the client-side when they fall outside of handshake limits. It seems that when we call accept_inbound_channel and InboundV1Channel::new fails due to the limits, the Close error gets mapped to an APIError instead of being handled.

rust-lightning/lightning/src/ln/channelmanager.rs

Lines 6111 to 6120 in 75822b8

	InboundV1Channel::new(&self.fee_estimator, &self.entropy_source, &self.signer_provider,
	counterparty_node_id.clone(), &self.channel_type_features(), &peer_state.latest_features,
	&unaccepted_channel.open_channel_msg, user_channel_id, &self.default_configuration, best_block_height,
	&self.logger, accept_0conf).map_err(|e| {
	let err_str = e.to_string();
	log_error!(logger, "{}", err_str);
	APIError::ChannelUnavailable { err: err_str }
	})
	}

We also can't call ChannelManager::force_close_without_broadcasting_txn after the failure since the channel is removed.