Update cache key for class map query
Update cache key for class map query

Summary: I forgot to update these after D13572 and D13588.

Test Plan: N/A

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D13599

julkiewicz/libphutil,julkiewicz/libphutil,julkiewicz/libphutil