Fix query types on maniphest fulltext search.

Summary:
Parameter type is not used anywhere. Instead param types is used.
Due this bug search was performed over whole index instead on tasks only.

Test Plan:

• Setup phabricator to run with Elasticsearch.
• Open http://yourphab.com/conduit/method/maniphest.query/
• Fill fullText field only.
• Expect get results. Query should be performed on /phabricator/TASK/ only (not on whole /phabricator/ index).

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D12542