Bug 9695 - Use alphabet system preference on page used to browse patrons for patron...

Bug 9695 - Use alphabet system preference on page used to browse patrons for patron card batches

When adding patrons to a batch for creating patron cards, the template
shows alphabet links for browsing all patrons. This patch converts the
hard-coded alphabet links to use the new alphabet system preference.

To test, go to the patron card creator and create a new batch. Click
"Add items" to pop up the window for browsing for patrons to add to the
batch. You should see a working array of alphabet letters which link to
patron search results.

Signed-off-by: David Cook <dcook@prosentient.com.au>
The patch adds consistency to the interface and works as described.
Signed-off-by: Jonathan Druarth <jonathan.druart@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>