Remove duplicated country code from operating class lists

Remove duplicated country code from operating class lists

CA country code was included mistakenly (copy-paste..) in cn_op_class_cc
while it was supposed to be included only in us_op_class_cc. In
practice, this did not result in incorrect operation due to the
us_op_class_cc list being checked first. Anyway, better fix
cn_op_class_cc to avoid confusion here.

Signed-off-by: Jouni Malinen <j@w1.fi>