Fix the condition for an expert info

The condition triggering an expert info if the reliability
parameter is non-zero, but a reliable data channel is
negotiated was wrong. Now the type field is considered
correctly.
While there, update the reference.

Change-Id: I1f2f78861d6a44c5334fd44e2038bbfdc52fa919
Reviewed-on: https://code.wireshark.org/review/4900
Reviewed-by: Michael Tüxen <tuexen@wireshark.org>