Bug 15448: (follow-up) Fetch the patron category once

Bug 15448: (follow-up) Fetch the patron category once

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit c9f66f5e6b5360a57885c26436c7eb3f2747bd28)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit cdfea7001131055c8d91459d4c48dbc4adb4741e)

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>