pdevs/mpi: remove multihreading in first level

src/tests/mpi/cluster/graph_manager.hpp

@@ -265,7 +265,7 @@ public:
     { }
 
 private:
-    paradevs::pdevs::multithreading::Coordinator <
+    paradevs::pdevs::Coordinator <
   common::DoubleTime, LevelGraphManager, paradevs::common::NoParameters, RootGraphManagerParameters > S;
 };