R1:f07f7bfaa48c

Remove unused Conpherence sprites

Summary: These were refactored out a while ago

Test Plan: Grep codebase, use Conpherence on desktop, mobile.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11023