R1:0407b22ea260

Move "Stale" / "Old" to date icon in Differential list view

Summary: Ref T3485. Moves "Stale" / "Old" to the right.

Test Plan: {F48653}

Reviewers: chad

Reviewed By: chad

CC: aran

Maniphest Tasks: T3485

Differential Revision: https://secure.phabricator.com/D6354