Bug 23542: Fix SRU import encoding

Bug 23542: Fix SRU import encoding

When importing records from a SRU server, the diacritics have bad encoding.
I reproduce with BNF server so it may be a UNIMARC issue.

Tests show that difference between Z39.50 server and SRU is that leader contains 'a' at postion 9.
Looking at MARC::Record->encoding() shows that encoding depends on leader even for UNIMARC.
So this patch adds a call to MARC::Record->encoding('UTF-8') in case of a SRU server in C4::Breeding.

Same use exists in Koha::MetadataRecord::Authority::get_from_breeding().

In case of import via Z3950, MarcToUTF8Record() is called,
 which calls SetMarcUnicodeFlag(),
 which calls MARC::Record->encoding('UTF-8')

Test plan :
1) Use a UNIMARC database
2) Configure a connexion to a UNIMARC SRU, for example BNF,
   see https://doc.biblibre.com/koha/autour_de_koha/serveurs_z3950_sru#serveur_de_la_bnf
3) Go to cataloguing module
4) Click on 'New from Z39.50/SRU'
5) Choose only the SRU target
6) Search for ISBN 2266072889
7) Confirm you see good encoding : diacritic on 'a' of title 'Strate-a-gemmes'
8) Click on 'Marc preview'
9) Confirm you see good encoding
10) Click import
11) Confirm you see good encoding
12) Check also Authorities import via SRU
13) Check also SRU imports on a MARC21 database

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Amended: Removed change to new_from_xml call. We should respect syntax.
But the added MARC::Record encoding does the tric! Which is implicit
for Z3950 targets where MarcToUTF8Record does the same.
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 19d9ba176dea6b7816a33b014a5f9e309af53dc0)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>