Bug 35008: Make ILS-DI not require auth when OpacPublic disabled

Bug 35008: Make ILS-DI not require auth when OpacPublic disabled

To test, disable OpacPublic and ensure a call to ilsdi.pl will still return expected results from a private browser, not logged into the OPAC.

Sponsored-by: Auckland University of Technology
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit eb130f559ecc0a232adce9a8af0084a99d6e9a81)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>