Minor fix for the `ArcanistXHPASTLinter`.
Minor fix for the `ArcanistXHPASTLinter`.

Summary: This `LINT_PHP_53_FEATURES` should have been replaced with `LINT_PHP_COMPATIBILITY` in D9576.

Test Plan: Ran `arc unit`.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9655

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