Bug 12058: make OverDrive search results page show cart, lists, and login links

Bug 12058: make OverDrive search results page show cart, lists, and login links

The template for OverDrive search results in the Bootstrap OPAC doesn't
show the cart, lists, or login links because the template's checks of
related system preferences relies on [% USE Koha %], which is not
present. This patch adds it.

To test, enable the bootstrap theme and OverDrive integration
(OverDriveClientKey, etc.). Perform a search in the OPAC and click to
view results from your OverDrive library. Confirm that cart, lists, and
login links appear in the header.

Signed-off-by: Jesse Weaver <pianohacker@gmail.com>
Bug confirmed, and this patch fixes it.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>