LP1724725: Handle ident_type2 in Web Staff User Editor

LP1724725: Handle ident_type2 in Web Staff User Editor

While it was fairly harmless to not be able to set an ident_type2
value in the webstaff editor, the way things worked out if a user
had one set from the XUL client or direct manipulation an attempt
to save such a user would crash the cstore backend.

To test
-------
[1] Use the patron editor to edit a patron that has a value set
    for ident_value2. Save a change, but note that nothing is
    displayed and that eventually an open-ils.cstore error is
    reported in the browser console.
[2] Apply the patch and repeat step 1. This time, the patron
    editor will display the secondary identification type field
    and allow you to save changes to the record.

Signed-off-by: Jason Boyer <JBoyer@library.in.gov>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>