Unmuting test #136388 fixed via #136367 (#136396)

mute came in right when pr was about to be merged, or whatever.
Basically, just need to unmute. Verified the PR fixed it.

closes: #136388 related:
#136367

Author: benwtrent

muted-tests.yml

@@ -636,9 +636,6 @@ tests:
 - class: org.elasticsearch.xpack.remotecluster.RemoteClusterSecurityBWCToRCS2ClusterRestIT
   method: testBwcCCSViaRCS1orRCS2
   issue: https://github.com/elastic/elasticsearch/issues/136368
-- class: org.elasticsearch.index.store.AsyncDirectIODirectoryTests
-  method: testIsLoaded
-  issue: https://github.com/elastic/elasticsearch/issues/136388
 - class: org.elasticsearch.xpack.restart.FullClusterRestartIT
   method: testServiceAccountApiKey {cluster=UPGRADED}
   issue: https://github.com/elastic/elasticsearch/issues/136390