Remove orphan CSS selectors for differential-haunt-mode
Summary:
Added in rP29d8fc04e50b83fc7cf09f428ef905aa5e54e838.
Usage removed in rPb5722a99635adb513036b9741fccdfc61b5e4472.
Test Plan: Grep the code for "haunt". Get no results.
Reviewers: O1 Blessed Committers, valerio.bozzolan
Reviewed By: O1 Blessed Committers, valerio.bozzolan
Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Differential Revision: https://we.phorge.it/D25997