Fixing a few vortex API issues

The input scalar field has now to be set using `SetInputArrayToProcess`
Status Job ID Name Coverage
  External
passed cdash-buildbot

passed ghostflow-branch-check-master

failed vtk@master-adora-linux-shared-release+cuda+gcc+mpi+optix+python2+tbb+vtkm

00:33:20

passed vtk@master-bigmac-osx-shared-debug+adios2+clang+python2+vtkm

passed vtk@master-duma-linux-shared-release+osmesa+ospray

failed vtk@master-eeloo-linux-shared-release+adios2+extdeps+java+mpi+python3+qt+tbb+vtkm

00:57:28

failed vtk@master-eeloo-linux-shared-release+mpi+nogl

00:57:28

passed vtk@master-luigi-linux-shared-release+mpi+python2+tbb

00:24:11

failed vtk@master-mun-windows-shared-release+kits+mpi+python3+qt+tbb

00:00:54

failed vtk@master-mun-windows-shared-release+mpi+python3+tbb+vtkm

failed vtk@master-mun-windows-static-release+mpi+qt+tbb

00:01:01

passed vtk@master-taanab-linux-shared-release+adios2+mpi+python2

00:23:37

passed vtk@master-trey-osx-shared-release+python3+qt

00:47:07

passed vtk@master-bigmac-osx-shared-debug+adios2+clang+python2+vtkm

passed vtk@master-bigmac-osx-shared-debug+adios2+clang+python2+vtkm

00:26:28

passed vtk@master-bigmac-osx-shared-debug+adios2+clang+python2+vtkm

passed vtk@master-bigmac-osx-shared-debug+adios2+clang+python2+vtkm

passed vtk@master-duma-linux-shared-release+osmesa+ospray

00:20:35

passed vtk@master-duma-linux-shared-release+osmesa+ospray

passed vtk@master-duma-linux-shared-release+osmesa+ospray

passed vtk@master-duma-linux-shared-release+osmesa+ospray

failed vtk@master-mun-windows-shared-release+mpi+python3+tbb+vtkm

failed vtk@master-mun-windows-shared-release+mpi+python3+tbb+vtkm

00:01:52

failed vtk@master-mun-windows-shared-release+mpi+python3+tbb+vtkm

failed vtk@master-mun-windows-shared-release+mpi+python3+tbb+vtkm