use Websocket to publish Qos1 message cause function_clause for emqx_coap subscriber

[WengangChen]

emqx_coap_mqtt_adapter.erl:

proto_deliver_ack(#message{qos = ?QOS_0}, Proto) ->
    Proto;
proto_deliver_ack(#message{qos = ?QOS_1, headers = #{packet_id := PacketId}}, Proto) ->
    case emqx_protocol:received(?PUBACK_PACKET(PacketId), Proto) of
        {ok, NewProto} -> NewProto;
        Other          -> error(Other)
    end;
proto_deliver_ack(#message{qos = ?QOS_2, headers = #{packet_id := PacketId}}, Proto) ->
    case emqx_protocol:received(?PUBREC_PACKET(PacketId), Proto) of
        {ok, NewProto} ->
            case emqx_protocol:received(?PUBCOMP_PACKET(PacketId), NewProto) of
                {ok, CurrentProto} -> CurrentProto;
                Another            -> error(Another)
            end;
        Other -> error(Other)
    end.

but Websocket send message without packet_id in headers.