Fix `LINT_KEYWORD_CASING` for `class` keyword
Fix `LINT_KEYWORD_CASING` for `class` keyword

Summary: D10653 didn't quite cut it.

Test Plan: Tested on a real file.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D10656

eSpark/arcanist,jra3/arcanist,alexmv/arcanist,Symplicity/arcanist,kevinseelbach/arcanist,coursera/arcanist,uber/arcanist,KieranHayes/arcanist,r4nt/arcanist,jra3/arcanist,calblueprint/arcanist,calblueprint/arcanist,zhihu/arcanist,chundongwang/arcanist,hach-que/arcanist,aik099/arcanist,coursera/arcanist,codelabs-ch/arcanist,Symplicity/arcanist,fivestars/arcanist,memsql/arcanist,zhihu/arcanist,wharris/arcanist,wikimedia/phabricator-arcanist,phacility/arcanist,phacility/arcanist,coursera/arcanist,Khan/arcanist,fivestars/arcanist,haskell-infra/arcanist,codelabs-ch/arcanist,hach-que/arcanist,folsom-labs/arcanist,codelabs-ch/arcanist,wikimedia/phabricator-arcanist,eSpark/arcanist,codelabs-ch/arcanist,aik099/arcanist,haskell-infra/arcanist,codelabs-ch/arcanist,haskell-infra/arcanist,zhihu/arcanist,coursera/arcanist,PageUpPeopleOrg/arcanist-patches,r4nt/arcanist,wharris/arcanist,sneakpeeq/arcanist,haskell-infra/arcanist,zhihu/arcanist,wxstars/arcanist,alexmv/arcanist,wikimedia/phabricator-arcanist,KieranHayes/arcanist,jra3/arcanist,uber/arcanist,alexmv/arcanist,wharris/arcanist,sneakpeeq/arcanist,PageUpPeopleOrg/arcanist-patches,PageUpPeopleOrg/arcanist-patches,r4nt/arcanist,alexmv/arcanist,fivestars/arcanist,wxstars/arcanist,Khan/arcanist,phacility/arcanist,kevinseelbach/arcanist,eSpark/arcanist,wxstars/arcanist,aik099/arcanist,memsql/arcanist,chundongwang/arcanist,memsql/arcanist,KieranHayes/arcanist,kevinseelbach/arcanist,chundongwang/arcanist,sneakpeeq/arcanist,wharris/arcanist,phacility/arcanist,r4nt/arcanist,Khan/arcanist,aik099/arcanist,Khan/arcanist,Symplicity/arcanist,hach-que/arcanist,uber/arcanist,chundongwang/arcanist,folsom-labs/arcanist,PageUpPeopleOrg/arcanist-patches,phacility/arcanist,memsql/arcanist,folsom-labs/arcanist,KieranHayes/arcanist,Symplicity/arcanist,sneakpeeq/arcanist,wxstars/arcanist,wikimedia/phabricator-arcanist,calblueprint/arcanist,calblueprint/arcanist,folsom-labs/arcanist,kevinseelbach/arcanist,uber/arcanist,eSpark/arcanist,hach-que/arcanist,fivestars/arcanist,jra3/arcanist