Bug 17616: Select tag on elasticsearch mappings page is not closed properly

Bug 17616: Select tag on elasticsearch mappings page is not closed properly

Test plan
1) Have SearchEngine syspref set to Elastic
2) Look at source on admin/searchengine/elasticsearch/mappings.pl
-> without patch you'll see select with attribute
   data-id="mapping_search_field_name" closing tag written badly as
   "/select>"
-> with patch everything looks OK

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>