Bug 33297: Fix typo system preference RetainPatronSearchTerms in DB revs 220600044.pl

Bug 33297: Fix typo system preference RetainPatronSearchTerms in DB revs 220600044.pl

Bug 26247 added system preference RetainPatronsSearchTerms.
There is a typo in DB revs 220600044.pl : RetainPatronSearchTerms instead of RetainPatronsSearchTerms.

Test plan :
Upgrade from 22.05 to 22.11 and check there is a system preference named 'RetainPatronsSearchTerms'

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>