RSVP: Conversations / Endpoint: wrong filter when select a RSVP conversations / endpoint (INVALID == a.x.y.z ...)

Change-Id: I70f6afd41eefddb42829c3d5f890ea67dcd65537
Reviewed-on: https://code.wireshark.org/review/6037
Reviewed-by: Anders Broman <a.broman58@gmail.com>