[Redesign] Alight right gutter on ObjectItemList better

Summary: Ref T8099, These should align out to 4px from the edge of the line, not 10px.

Test Plan: Test dashboards, Maniphest, Workboards

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T8099

Differential Revision: https://secure.phabricator.com/D13400