If FlaggedRevisions is being used then older revisions will be
shown as if they are the current revision of the page. This causes
problems as it makes it hard to give a true indication of when
something was last modified - do you show the last time someone
made an edit or the last time someone approved an edit?
The same issue applies on revisions and we attempted to fix this
earlier in T153125 but in doing so caused this problem.
Bug: T180116
Change-Id: I6d47adf272c99791d4af9f97afa02799d495887e
b72c10e06f