Fix conduit result tables on mobile views

Summary: Fixes T8139. These tables don't setHeaders(), so we don't correctly default columns to be visible on devices.

Test Plan: Conduit results now visible on devices.

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T8139

Differential Revision: https://secure.phabricator.com/D12784