Commented out unused variables in HeatEquationBenchmarkProblem

            userData.real_u = uDofs->getData();

            userData.real_fu = fuDofs->getData();

#endif                        

            /*

            const IndexType gridXSize = mesh->getDimensions().x();

            const IndexType gridYSize = mesh->getDimensions().y();

            dim3 cudaBlockSize( 16, 16 );

            dim3 cudaGridSize( gridXSize / 16 + ( gridXSize % 16 != 0 ),

                               gridYSize / 16 + ( gridYSize % 16 != 0 ) );

            */

            TNL::Devices::Cuda::synchronizeDevice();

            int cudaErr;