Bug 11171: (follow-up) fix a javascript error

The previous patch adds an error on booksellers.pl:

TypeError: a.aoColumns[c] is undefined

It was caused by the add of the new column. The aoColumns DT parameter
should manage it.

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>

koha-tmpl/intranet-tmpl/prog/en/modules/acqui/booksellers.tt

@@ -19,7 +19,7 @@ $(document).ready(function() {
         'bInfo': false,
         "aaSorting": [[ 1, "asc" ]],
         "aoColumns": [
-            null,null,null,null,null,null,{ "sType": "title-string" },{ "sType": "title-string" },null
+            null,null,null,null,null,null,{ "sType": "title-string" },null,{ "sType": "title-string" },null
         ],
         'aoColumnDefs': [
             { 'aTargets': [-1], 'bSortable': false }