Icons: Remove duplicate icon names from PHUIIconExample
Summary:
http://phorge.localhost/uiexample/view/PHUIIconExample/ lists `fa-git` and `fa-hacker-news` twice.
(I only refer to duplicate _names_. Duplicate _icons_ due to name aliases is a different topic.)
`PHUIIconView::getIcons()` is to blame for that content.
Remove these two duplicate name entries.
Test Plan: Look at http://phorge.localhost/uiexample/view/PHUIIconExample/ and search for `fa-git` and `fa-hacker-news`.
Reviewers: O1 Blessed Committers, mainframe98
Reviewed By: O1 Blessed Committers, mainframe98
Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Differential Revision: https://we.phorge.it/D26303