Bug 21635: [sql_modes] Remove GROUP BY clause in batchMod.pl

Bug 21635: [sql_modes] Remove GROUP BY clause in batchMod.pl

batchMod.pl: DBD::mysql::st execute failed: 'koha_kohadev.authorised_values.authorised_val
ue' isn't in GROUP BY [for Statement "SELECT authorised_value, lib FROM authorised_values LEFT JOIN authorised_values_branches ON ( id = av_id )  WHERE category = ? AND ( branchcode = ? OR branchcode IS NULL )
GROUP BY lib ORDER BY lib, lib_opac" with ParamValues: 0='WITHDRAWN', 1="CPL"] at /home/vagrant/kohaclone/tools/batchMod.pl line 396.

We must use Koha::AuthorisedValues->search instead of a raw SQL query.

Test plan:
Edit some items in a batch
Confirm that the dropdown list (AV) are correctly filled

We will lose speed efficiency here, but better to be consistent, then cache AV in Koha::AuthorisedValues

Signed-off-by: Andrew Isherwood <andrew.isherwood@ptfs-europe.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>