LP#1981714: fix Dojo AutoFieldWidget initialization bug

LP#1981714: fix Dojo AutoFieldWidget initialization bug

This patch fixes a bug where AutoFieldWidget wouldn't
invoke the callback when building an org unit selector. Fixing this
allows library settings (including acq.default_owning_lib_for_auto_lids
added in the previous patch) whose datatype is link and whose fm_class
is aou to work in the Dojo Library Settings editor.

Signed-off-by: Galen Charlton <gmc@equinoxOLI.org>
Signed-off-by: Ruth Frasur <rfrasur@library.in.gov>
Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Jane Sandberg <js7389@princeton.edu>