Bug 26223: include item information in OPAC ISBD view

Bug 26223: include item information in OPAC ISBD view

The ISBD view in the OPAC interface does not display item information.

This patch fixes that.

Test plan:
0) Have a biblio with at least one item attached to it and include one
   of the following snippets in the OPACISBD system preference,
   depending on your MARC flavour:

   MARC21:
   #952|<br/><h2>Items</h2><table><th>Copy number</th><th>Shelving
   location</th><th>Koha item type</th><th>Barcode</th><th>Call number
   (Full call number)</th><th>Materials specified (bound volume or
   other part)</th>|<tr><td>{952t} </td><td> {952c} </td><td> {952y}
   </td><td> {952p} </td><td> {952o} </td><td> {9523}</td></tr>|</table>

   UNIMARC:
   #995|<br/><h2>Items</h2><table><th>Copy number</th><th>Shelving
   location</th><th>Koha collection</th><th>Barcode</th><th>Call number
   (Full call number)</th><th>Numbering (volume or other part)</th>|
   <tr><td>{9956} </td><td> {995e} </td><td> {995h} </td><td> {995f}
   </td><td> {995k} </td><td> {995l}</td></tr>|</table>

   Switch to the OPAC ISBD view for your biblio; notice how it does
   not display item information.
1) Apply the patch, and restart Plack/memcached if necessary.
2) Refresh the OPAC ISBD view page, this time you should see item
   information as per the OPACISBD system preference setting.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>