Update injection2pniproblem.hh

exercises/solution/exercise-basic/injection2pniproblem.hh

@@ -54,7 +54,8 @@ SET_TYPE_PROP(Injection2pNITypeTag, SpatialParams,
                                      typename GET_PROP_TYPE(TypeTag, Scalar)>);
 
 // Set fluid configuration
-SET_TYPE_PROP(Injection2pNITypeTag, FluidSystem, FluidSystems::H2ON2<typename GET_PROP_TYPE(TypeTag, Scalar), false>);
+SET_TYPE_PROP(Injection2pNITypeTag, FluidSystem,
+    FluidSystems::H2ON2<typename GET_PROP_TYPE(TypeTag, Scalar), FluidSystems::H2ON2DefaultPolicy</*fastButSimplifiedRelations=*/ true>>);
 } // end namespace Properties
 
 /*!