R1:3d4079a4891e

Standardize spacing when icons have text

Summary: Our standard icon -> button spacing is 4px, not 8px.

Test Plan: Review search icon in Conpherence Full

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D12365