Bug 30395: Fix TT filtering of publicationyear in reserve/request.tt

Bug 30395: Fix TT filtering of publicationyear in reserve/request.tt

biblioitems.publicationyear is not a date (it can be, but we cannot
guarantee that) so the $KohaDates filter should not be used on this data

Test plan:
1. Verify that in the default MARC framework there is a field linked to
   biblioitems.publicationyear (typically it's 210$d for UNIMARC)
2. Create a biblio with a non ISO-formatted date in this field. It
   can be a "YYYY" year for instance. Create an item for this biblio.
3. Try to place a hold on this biblio. If it works, you can sign off

Signed-off-by: Sonia <sonia.bouis@univ-lyon3.fr>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>