Updating XML definition of vtkImageDataToUniformGrid filter.

vtkImageDataToUniformGrid filter is missing the FieldDataDomain
section of its XML proxy definition. This results in vtkPVPost
filter to make point data arrays of stuff that was meant to be
cell data arrays.

Change-Id: Ia1262ab2cdce8173459653c3b4f18503f7fa5e35
Merge topic '14742_vtkImageDataToUniformGrid' into next

44e7bf41 Updating XML definition of vtkImageDataToUniformGrid filter.