tipc: fix nametable publication field in nl compat

The publication field of the old netlink API should contain the
publication key and not the publication reference.

Fixes: 44a8ae94 (tipc: convert legacy nl name table dump to nl compat)
Signed-off-by: Richard Alpe <richard.alpe@ericsson.com>
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>