[Redesign] Fix Pager on Phriction History

Summary: Ref T8099, Fixes layout of the Pager, all adds distinction to the current pager button.

Test Plan: Edit a Phriction document 100 times. Get a pager.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T8099

Differential Revision: https://secure.phabricator.com/D13549