R1:751162d363e6

Set icons for Diviner PHID types

Summary: Ref T4558. Give `DivinerAtomPHIDType` and `DivinerBookPHIDType` a font icon.

Test Plan: Saw icons in global search.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T4558

Differential Revision: https://secure.phabricator.com/D13304