Bug 32908: Load item type icons from the correct path

Bug 32908: Load item type icons from the correct path

In the Staff interface, the details page of a bibliographic
record should display the icon associated with the item
type of an item ('Item type' column in the 'Holdings' tab).

This feature broke in v22.11.00 (for Debian package installs):
instead of the item type icon you get the default 'broken
image URL' image of your web browser.

This patch fixes that.

Test plan:

1) (if needed) Configure the following System preferences:
   - item-level_itypes => 'specific item'
   - noItemTypeImages  => 'Show'

2) (if needed) In Koha Administration > Item types, create
   an item type and associate it with an icon

3) (if needed) Create a test bibliographic record, and add
   an item to it that has an item type with an icon

4) Visit the bibliographic record's details page in the
   Staff interface. Notice that in the 'Item type' column of
   the 'Holdings' tab instead of seeing the icon associated
   with the item type of each item you get the default
   'broken image URL' image of your web browser [*].

   [*] In non-Debian package installs, the 'href' property
       of the item type icon's <img> tag should start with
       '/opac-tmpl/bootstrap/itemtypeimg'

5) Apply this patch, and refresh the page with CTRL-F5.
   The item type icon should now be displayed correctly.

   [*] KTD and Koha Sandboxes users: To verify the patch
       has worked, you should right-click on the item type
       icon and click 'Inspect: the 'href' property of the
       <img> tag should now start with:
       '/intranet-tmpl/prog/img/itemtypeimg'

Signed-off-by: Frédéric Demians <f.demians@tamil.fr>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>