Captive portal selects additional interfaces where it shouldn't
There's still an annoying bug in the captive portal of pfsense 2.1 Devel. It was already present in the 2.0.1 version.
When you enable captive portal on a interface greater than opt9, pfsense automatically select opt1 too in the interface dropdown menu.
And it's not just a cosmetic bug because captive portal is effective on both interfaces. If you remove opt1 and you hit apply, opt1 remains selected after refresh
Thanks for the support and for your great product
Rather than doig a string search do a proper matching of selected interfaces. Fixes #2378