Remove test mute for #110408 (#116595)

This was fixed by #113630 but without unmuting the test.

Backport of #116475 to 8.x
Closes #110408

Author: DaveCTurner

muted-tests.yml

@@ -17,9 +17,6 @@ tests:
 - class: org.elasticsearch.upgrades.SecurityIndexRolesMetadataMigrationIT
   method: testMetadataMigratedAfterUpgrade
   issue: https://github.com/elastic/elasticsearch/issues/110232
-- class: "org.elasticsearch.xpack.searchablesnapshots.FrozenSearchableSnapshotsIntegTests"
-  issue: "https://github.com/elastic/elasticsearch/issues/110408"
-  method: "testCreateAndRestorePartialSearchableSnapshot"
 - class: org.elasticsearch.xpack.security.authz.store.NativePrivilegeStoreCacheTests
   method: testPopulationOfCacheWhenLoadingPrivilegesForAllApplications
   issue: https://github.com/elastic/elasticsearch/issues/110789