refactored ClearCommunicators in tests

mlmc/tests/montecarlo/TestMonteCarlo.cpp

@@ -32,7 +32,7 @@ protected:
 
     void TearDown() {
         PPM->Barrier(0);
-        PPM->ClearCommunicators(false);
+        PPM->ClearCommunicators();
     }
 };
 

mlmc/tests/montecarlo/datastructure/TestWelfordAggregate.hpp

@@ -25,7 +25,7 @@ protected:
 
     void TearDown() {
         PPM->Barrier(0);
-        PPM->ClearCommunicators(false);
+        PPM->ClearCommunicators();
         delete meshes;
     }
 };