Bug 35588: Scope authorised value desc lookup according to field/subfield

Bug 35588: Scope authorised value desc lookup according to field/subfield

This patch ensures that the authorised value descriptions looked up
are for the correct field/subfield designated in the CSV profile.

Test plan:
0. Do not apply the patch yet!
1. Go to http://localhost:8081/cgi-bin/koha/tools/csv-profiles.pl
2. Add a CSV profile with the default values and using the following
for the "Profile MARC fields":
000|001|003|005|006|007|008|010|015|016|020|022|040|050|082|100|110|
111|130|240|243|245|246|247|250|260|300|336|337|338|440|490|500|501|
505|520|530|600|610|611|630|648|650|651|690|700|710|711|856|887|942|995

3. Create a new List
4. Add all the database's bibs to that list using SQL like the following (where the shelfnumber equals the number for your list):
insert into virtualshelfcontents (shelfnumber,biblionumber,borrowernumber) select 1,biblionumber,51 from biblio;

5. Go to that list in the staff interface
6. Download that list using your CSV profile

7. Apply the patch
8. koha-plack --reload kohadev

9. Download that list using your CSV profile
10. Note that the output is a little slower, but still quick enough.
11. Note that the output is a bit different. For records like "Gairm",
the output will end in "1" instead of "Yes". This is correct, because
this subfield isn't an authorised value!!!

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>