Bug 36335: Fix ILS-DI GetRecords bad encoding for UNIMARC

Bug 36335: Fix ILS-DI GetRecords bad encoding for UNIMARC

ILS-DI GetRecords generates bad encoding of MARCXML for UNIMARC, like OAI in Bug 34467

Enable ILS-DI and display a record with :
<opac url>/cgi-bin/koha/ilsdi.pl?service=GetRecords&id=<biblionumber>

Well-known issue, fixed
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 5406aaedfa86aa97ed06019f4862bff285a4aad2)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>