Bug 28081: Make card number a label in patron search results

Bug 28081: Make card number a label in patron search results

This patch modifies the output of the AJAX patron search results so that
the number in the card number column is wrapped in a <label> tag which
triggers the corresponding checkbox.

To test, apply the patch and go to the Patrons module.

 - Perform a patron search which will return more than one result or
   click on a letter to browse.
 - In the search results, confirm that clicking any card number triggers
   the corresponding checkbox.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>