Bug 24576: `StoreLastBorrower` preference is in the wrong tab and is confusing

Bug 24576: `StoreLastBorrower` preference is in the wrong tab and is confusing

This patch moves the preference from OPAC/Privacy to Circulation/Check
In

To Test:

1) Apply the patch
2) Check that the system preference no longer displays under the OPAC
Privacy tab
3) Check that it now displays in the Circulation tab, under the Check In
policy
4) Ensure that the system preference can be changed and saved correctly.

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>