[AppDB] Fix up showing too many votes in votestats

[Paul van Schayck]

The query used in votestats was wrong. Sometimes it would show way too
many votes for an application.  Look at
http://appdb.winehq.org/votestats.php?categoryId=82
Compare with
http://appdb.winehq.org/votestats.php

This was caused by a wrongly build query.
The query was wrongly linking the appCategory table with the appFamily table.

The new query was quite a pain to make. I've documented into
votestats.php as comment.

Changelog:
- Fix the per category query. It was showing too many votes in some cases.
- Use query_appdb
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