Unmute PolicyUtilsTests.testFormatFilesEntitlement (elastic#127654)

Author: prdoyle

muted-tests.yml

@@ -318,9 +318,6 @@ tests:
 - class: org.elasticsearch.index.engine.ThreadPoolMergeSchedulerTests
   method: testSchedulerCloseWaitsForRunningMerge
   issue: https://github.com/elastic/elasticsearch/issues/125236
-- class: org.elasticsearch.entitlement.runtime.policy.PolicyUtilsTests
-  method: testFormatFilesEntitlement
-  issue: https://github.com/elastic/elasticsearch/issues/126176
 - class: org.elasticsearch.xpack.security.SecurityRolesMultiProjectIT
   method: testUpdatingFileBasedRoleAffectsAllProjects
   issue: https://github.com/elastic/elasticsearch/issues/126223