examples: fix wrong group mask number in nfct-event
examples: fix wrong group mask number in nfct-event

This patch replaces event group numbers NFNLGRP_CONNTRACK_* by the
event group mask NF_NETLINK_CONNTRACK_*

Signed-off-by: Pablo Neira Ayuso <707d14912bb250caf67dfe0ea4035681fbfc4f56@netfilter.org>

greearb/libmnl-ct,chamaken/libmnl,remfalc/vyt-libmnl,vyos/libmnl,threatstack/libmnl,fqrouter/libmnl,fqrouter/libmnl,threatstack/libmnl,remfalc/vyt-libmnl,cyclops8456/libmnl,cyclops8456/libmnl,vyos/libmnl,cyclops8456/libmnl,vyatta/libmnl,chamaken/libmnl,greearb/libmnl-ct,vyatta/libmnl,Distrotech/libmnl,vyos/libmnl,Distrotech/libmnl