R1:41ea204144ab

Update one straggling "CAN_INTERACT" check in comment removal

Summary: See rPaacc62463d61. D20551 added some `CAN_INTERACT` checks, but `CAN_INTERACT` needs to be checked with `canInteract()` to fall back to `CAN_VIEW` properly. D20558 cleaned up most of this but missed one callsite; fix that up too.

Test Plan: Removed a comment on a commit.

Reviewers: amckinley, 20after4

Reviewed By: amckinley

Differential Revision: https://secure.phabricator.com/D20648