LP#1888518: fix authority delete/undelete in AngularJS editor

LP#1888518: fix authority delete/undelete in AngularJS editor

This patch ensures that authority record deletion and undeletion
works in the AngularJS editor.

To test
-------
[1] Go to Manage Authorities -> search -> edit a hit, then
    click the delete button in the editor window.
[2] Note that the record is not deleted.
[3] Apply the patch.
[4] Repeat step 1; this time, the record should be deleted, as
    can be verified by rerunning the search in the authorities
    window.
[5] Click the undelete button; verify that the record shows
    up again.

Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>