Bug 12206: fix HTML in other holdings list in staff search results page

Bug 12206: fix HTML in other holdings list in staff search results page

To test:

[1] View, in the staff interface, a record with alternate holdings
    (as controlled by the AlternateHoldingsField system preference).
[2] Verify that the HTML list is closed correctly.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>