Bug 19559: Add '-' to list of characters we don't split search terms on

Bug 19559: Add '-' to list of characters we don't split search terms on

Test plan assumes
QueryAutoTruncate = automatically
SearchEngine = Elasticsearch

To test:
0 - Apply Unit test patch only
1 - prove t/db_dependent/Koha_SearchEngine_Elasticsearch_Search.t
2 - Should fail
3 - Apply this patch
4 - prove t/db_dependent/Koha_SearchEngine_Elasticsearch_Search.t
5 - should pass
6 - search for 'Local-number:"4"' (or a vlid biblionumber)
7 - should get expected result

Signed-off-by: David Bourgault <david.bourgault@inlibro.com>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>