Provide an application link for the Macro PHID type

Summary: Ref T9625. This is an example of how to fill in the missing calls.

Test Plan:

• Verified that an icon is now shown for feed stories.
• Verified that an icon is now shown in the "PHID Types" module panel in Config.

{F906325}

{F906326}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9625

Differential Revision: https://secure.phabricator.com/D14324