smoketest: openvpn: fix testcase for server statement
smoketest: openvpn: fix testcase for server statement

After commit 7e546be921 ("openvpn: T2994: temporary revert to 1.2 crux behavior
for client pools") also adjust the testcase to not expect the "nopool" statement
on the server command.

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