flow-accounting: T3132: fix egress iptables chain
flow-accounting: T3132: fix egress iptables chain

(cherry picked from commit 95cc2e4b4c11414cc71749af12abb575e96e5bd4)

vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x