Counts for total and filtered are the same

[ghybs]

When using DataTables "search" input field, node-datatable correctly builds 2 count queries (recordsTotal and recordsFiltered). However, those 2 queries are always identical.

Live demo: https://plnkr.co/edit/PZiw9h5z0AgqSAQIfcXM?p=preview

It seems that the buildCountStatement private function always uses the search string through the buildWherePartial private function: https://github.com/jpravetz/node-datatable/blob/ca25ef76b94743ee8101320baae37615797676db/lib/builder.js#L81-L87

It looks like previously the search string had to be explicitly provided to produce a different result: https://github.com/jpravetz/node-datatable/blob/ca25ef76b94743ee8101320baae37615797676db/lib/builder.js#L77-L78