Bug 20806: Add item type description holds history page

Bug 20806: Add item type description holds history page

Test plan:

0) Do not apply the patch
1) Set AllowHoldItemTypeSelection to Allow
2) Place some hold for a patron, some with specific item type and some
without item type
3) On holds history page you should see blank or item type code in item
type column
4) Apply the patch
5) Now you should see description in item type column
6) Set AllowHoldItemTypeSelection to Don't Allow
7) You shold not see the item type column, but column visibility
settings should continue working ;)

Signed-off-by: Maryse Simard <maryse.simard@inlibro.com>
Followed the test plan and it works.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>