R1:c99d84793b3f

Don't show "View Raw" for removed comments

Summary: Fixes T7232.

Test Plan: Saw "View Raw" gone for removed comment, still present and functional for non-removed comment.

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T7232

Differential Revision: https://secure.phabricator.com/D11926