R1:bcd592cf7e15

Remove support for "paths" parameter in "differential.query"

Summary: See T13639. This change simplifies providing a more modern approach to querying this data via "differential.revision.search".

Test Plan: Called "differential.query" with paths (got an error) and without paths (got a valid query result).

Differential Revision: https://secure.phabricator.com/D21613