Bug 11998: Do not clear syspref cache in psgi file

Bug 11998: Do not clear syspref cache in psgi file

This in only in koha.psgi, it has been introduced by bug 13815 but
should not have been added by this patch.

Removing it should not introduce any changes.
Not that it won't impact debian packages.

Signed-off-by: Tomas Cohen Arazi <tomascohen@unc.edu.ar>
Signed-off-by: Jacek Ablewicz <abl@biblos.pk.edu.pl>
Signed-off-by: Brendan Gallagher brendan@bywatersolutions.com
(cherry picked from commit f25e3ed90b55b657c71e117a1e9a8bc2c3a1809f)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>