The Authority Control Set code expects the format of subfields
that it will be used to build a MARC.Field object to be of the
form: [[code,value],...] This commit makes that true.
Additionally, dojo.filter over a list of lists can cause the
nested array set to be flattened. So, instead, we loop directly.
Signed-off-by: Mike Rylander <mrylander@gmail.com> Signed-off-by: Bill Erickson <berick@esilibrary.com>