[Redesgin] Misc Inline Comment tweaks
Summary: Ref T8099. Better alignment with TODO and Ghost Icons.
Test Plan: Test more states of inline comments, ghosts, todos, unsubmitted, etc.
Reviewers: btrahan, epriestley
Reviewed By: epriestley
Subscribers: epriestley, Korvin
Maniphest Tasks: T8099
Differential Revision: https://secure.phabricator.com/D13515