Bug 25053: Clarify the description of syspref PatronSelfRegistrationExpireTemporaryAc...

Bug 25053: Clarify the description of syspref PatronSelfRegistrationExpireTemporaryAccountsDelay

This patch changes the wording of this system preference.

To test:

1) Check the current wording of this system preference.
2) Install the patch.
3) Check that the wording of this system preference has changed to "Delete patrons still in the category indicated by PatronSelfRegistrationDefaultCategory X days after account creation."

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Joy Nelson <joy@bywatersolutions.com>