Restrict Audit buckets to just ApplicationSearch views

Summary: Fixes T9363. This drops empty buckets from dashboard panel context. Still see full results in Audit.

Test Plan: Create an "Active Audits" panel, add to Dashboard. See no commits found. Check Audit, see all buckets.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T9363

Differential Revision: https://secure.phabricator.com/D17545