fix MSVC errors

NumLib/ODESolver/ODESystem.h

@@ -55,7 +55,7 @@ public:
                           GlobalMatrix& M, GlobalMatrix& K,
                           GlobalVector& b) = 0;
 
-    using Index = typename MathLib::MatrixVectorTraits<GlobalMatrix>::Index;
+    using Index = MathLib::MatrixVectorTraits<GlobalMatrix>::Index;
 
     //! Provides known solutions (Dirichlet boundary conditions) vector for
     //! the ode system at the given time \c t.

NumLib/ODESolver/TimeDiscretizedODESystem.cpp

@@ -225,8 +225,7 @@ void TimeDiscretizedODESystem<
 
     if (known_solutions)
     {
-        using IndexType =
-            typename MathLib::MatrixVectorTraits<GlobalMatrix>::Index;
+        using IndexType = MathLib::MatrixVectorTraits<GlobalMatrix>::Index;
         std::vector<IndexType> ids;
         std::vector<double> values;
         for (auto const& bc : *known_solutions)