TransformData legacy code

This issue is found in the bleeding edge of master branch when built against VTK 9.0.

The following code:
```py
from mayavi.filters.transform_data import TransformData

frustum_filter = TransformData()
frustum_filter.transform.matrix.from_array(Rt) #Rt is a Numpy 4x4 array
```

causes `vtkTransform` to throw the warning:
```
InternalUpdate: doing hack to support legacy code. This is deprecated in VTK 4.2. May be removed in a future version.
```

I know you are busy with many modifications, but kindly take it in your consideration..