Always install the "icon" and "emoji" remarkup rules

Summary: Ref T10394. Currently, these rules are only active if the Macro application is installed. Instead, install them unconditionally.

Test Plan:

• Used {icon camera} with Macro installed and uninstalled.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10394

Differential Revision: https://secure.phabricator.com/D15311