LP#1691264 - WebStaff Add stickiness to Patron Search Org-level selector

LP#1691264 - WebStaff Add stickiness to Patron Search Org-level selector

When searching for users within the patron app, the org-unit selector
dropdown would stay cached to the last used value, but reloading the
PAtron sarch view would reset that. This adds stick-setting attribute
to that custom dropdown and LocalStorage via key eg.circ.patron.search.ou

Signed-off by: Cesar Velez <cesar.velez@equinoxinitiative.org>
Signed-off by: Jennifer Pringle <jennifer.pringle@bc.libraries.coop>
Signed-off-by: Kathy Lussier <klussier@masslnc.org>