Revert "Expose category totals in API response"
API meta=siteinfo is a frequently called API query
and the category totals database query is not
sufficiently fast enough to be part of this by default.
This reverts commit 45b4bf6382ad1c9245e9859bea0b26b24fac8459.
Change-Id: Ia5bf97855d48955ce53c3679c4d138fabafae8b7