T6895, Comment edit history should not provide action dropdown for transactions.

Summary: Fixes T6895, When viewing comment edit history, user should not see a dropdown for each comment edit transaction.

Test Plan: Edit task comment, view comment edit history, comment transactions should not provide a dropdown with action items.

Reviewers: Blessed Reviewers, epriestley

Reviewed By: Blessed Reviewers, epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6895

Differential Revision: https://secure.phabricator.com/D11355