Move 'Query' in Maniphest Search to be above the fold

Summary: (Needed a clean branch). Moves the field up and renames to Query

Test Plan: Visit Maniphest Search, see new field, test a query

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D10971