R1:c9de213750c1

Fix mobile previous revision inline comments

Summary: Fixes T9016, adds additonal space around icons.

Test Plan: Visit an old inline comment, no overlapping icon.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T9016

Differential Revision: https://secure.phabricator.com/D13914