Allow for old settings that have no iketype

This bit of code looks like it could do with the same test as https://github.com/pfsense/pfsense/pull/1412
This is executed when the "Connect" button is pressed from Status->IPsec
Somebody with these problematic old IPsec entries could test this - with current code I suspect that disconnect followed by connect - it will not connect. With this change it will (might?) connect again.
IPsec Widget allow for old settings that have no iketype

as mentioned in https://forum.pfsense.org/index.php?topic=84527.msg471919#msg471919
This change makes it work like similar if tests in /usr/local/wwwvpn_ipsec.php, and code in /etc/inc/vpn.inc that effectively defaults to ikev1 when iketype is not specified.
This should make the code here be executed and make $ikeid get the correct value to be used in later code.