BUG: Fix auto scalar range for model scalar arrays

When changing the active scalar field array, the range was not updated.
Note that the location where the scalar range might not be best,
it probably would have to be revisited at some point.
Closes #2897

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21679 3bd1e089-480b-0410-8dfb-8563597acbee
STYLE: Cleanup vtkMRMLDisplayNode PrintSelf output

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21680 3bd1e089-480b-0410-8dfb-8563597acbee