Bug 37399: Fix showing itemtype on holdings table

Bug 37399: Fix showing itemtype on holdings table

If syspref "noItemTypeImages" is disabled, holdings table won't display
itemtype column. This patch fixes this.

To reproduce:
1. Enable syspref "noItemTypeImages".
2. Find biblio with items.
   => Note that itemtype column is displayed on holdings table.
3. Disable syspref "noItemTypeImages".
   => Itemtype column is no longer displayed on holdings table.
4. Apply this patch.
   => Now column should be displayed correctly.

Sponsored-by: Koha-Suomi Oy
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>