Fix DiffusionLintController

Summary: Use proper method Fixes T4118

Test Plan: Test a lint page in Diffusion

Reviewers: epriestley, btrahan, vrana

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Maniphest Tasks: T4118

Differential Revision: https://secure.phabricator.com/D7598