Bug 18881: Remove dead code from view_holdsqueue.pl

Bug 18881: Remove dead code from view_holdsqueue.pl

Aleisha spotted the typo in $itemtypes and proposed a correction on bug 18859.
The description was not even used. Template calls GetDescription.

To test:
Verify that viewing the holds queue still works as expected.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit f40c093c19e21c6a8aa7a41d4e51fc4e3fc1d8e9)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>