[TEST] Remove BlockMultiValuedTests from muted tests list

This was added as a result of merging elastic#124327, via a bad merge. Fix that with this commit.

Author: javanna

muted-tests.yml

@@ -330,9 +330,6 @@ tests:
 - class: org.elasticsearch.smoketest.MlWithSecurityIT
   method: test {yaml=ml/3rd_party_deployment/Test start deployment fails while model download in progress}
   issue: https://github.com/elastic/elasticsearch/issues/120814
-- class: org.elasticsearch.compute.data.BlockMultiValuedTests
-  method: testToMask {elementType=BOOLEAN nullAllowed=true}
-  issue: https://github.com/elastic/elasticsearch/issues/124165
 - class: org.elasticsearch.smoketest.MlWithSecurityIT
   method: test {yaml=ml/start_data_frame_analytics/Test start classification analysis when the dependent variable is missing}
   issue: https://github.com/elastic/elasticsearch/issues/124168