packet: properly set packet type on cloned packets

Sometimes during TCP assembly, a new packet is created
from one of the fragments, cloning its data.

The field type, used to print the Transport column was
not being properly copied from the original packet.

Fixes #378

src/packet.c

@@ -56,6 +56,7 @@ packet_clone(packet_t *packet)
     // Create a new packet with the original information
     clone =    packet_create(packet->ip_version, packet->proto, packet->src, packet->dst, packet->ip_id);
     clone->tcp_seq = packet->tcp_seq;
+    clone->type = packet->type;
 
     // Append this frames to the original packet
     vector_iter_t frames = vector_iterator(packet->frames);