Fixes a regression after upgrading to Manticore 25.0.0.

Semantics of the value for 'total number of results' (returned by Manticore
daemon searchd) changed. It used to be the total number of available results
(ignoring current paging limits), capped to max_matches (max_matches is a
value that can be set on a per-request level, which defaults to 1000).

Now, it is the number of results returned in the current response.
Attempting to fetch more than max_matches will make searchd return an error.

Closes #3285.