Bug 9608 - White background on header on check in

Bug 9608 - White background on header on check in

The white background behind the header search form on the checkin
page appears because the search include is missing a <div> which carries
the background gradient CSS. This patch adds the missing markup to the
checkin search header include file and 6 others.

To test, view the following pages and confirm that the normal gradient
background appears behind the header search form:

- Checkin
- Contracts administration
- Currencies administration
- Notices and slips
- Printers administration (admin/printers.pl)
- Stop words administration (admin/stopwords.pl)
- Adding an order to a basket from a suggestions (Acquisitions -> Basket
  -> Add order to basket -> From a suggestions).

Signed-off-by: Nicole C. Engard <nengard@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>