Fix typo in test_AtlasG4_CavernBg_EVNT2TR.sh SimCoreTests ART script

Fixing typo pointed out in ATLASSIM-4367.

Simulation/Tests/SimCoreTests/test/test_AtlasG4_CavernBg_EVNT2TR.sh

@@ -29,6 +29,6 @@ echo  "art-result: $? simulation"
 ArtPackage=$1
 ArtJobName=$2
 # TODO This is a regression test I think. We would also need to compare these files to fixed references
-art.py compare grid --entries 2 ${ArtPackage} ${ArtJobName} --mode=summmary --file=*EVNT.pool.root
+art.py compare grid --entries 2 ${ArtPackage} ${ArtJobName} --mode=summary --file=*EVNT.pool.root
 
 echo  "art-result: $? regression"