Bug 5371: (follow-up) Force no caching for private pages at the OPAC

Bug 5371: (follow-up) Force no caching for private pages at the OPAC

Same as previous patch for opac-messaging.pl and opac-readingrecord.pl

Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@unc.edu.ar>
(cherry picked from commit a988e9425ce1f8f4bf28b46473adac941d634973)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>
(cherry picked from commit c5c954506f5400b8732ee37c52d86c009215ec8f)
Signed-off-by: Liz Rea <wizzyrea@gmail.com>