Update new test to round interpolation results.
Update new test to round interpolation results.

A change went in that changed some rounding behavior just before
the test was merged.

mspark93/VTK,keithroe/vtkoptix,gram526/VTK,jmerkow/VTK,SimVascular/VTK,gram526/VTK,keithroe/vtkoptix,sumedhasingla/VTK,gram526/VTK,sankhesh/VTK,jmerkow/VTK,sankhesh/VTK,sankhesh/VTK,SimVascular/VTK,SimVascular/VTK,sankhesh/VTK,jmerkow/VTK,sankhesh/VTK,SimVascular/VTK,keithroe/vtkoptix,mspark93/VTK,keithroe/vtkoptix,keithroe/vtkoptix,gram526/VTK,sumedhasingla/VTK,sumedhasingla/VTK,jmerkow/VTK,mspark93/VTK,mspark93/VTK,sumedhasingla/VTK,sankhesh/VTK,mspark93/VTK,gram526/VTK,jmerkow/VTK,jmerkow/VTK,keithroe/vtkoptix,sankhesh/VTK,sumedhasingla/VTK,sankhesh/VTK,keithroe/vtkoptix,sumedhasingla/VTK,SimVascular/VTK,jmerkow/VTK,gram526/VTK,keithroe/vtkoptix,sumedhasingla/VTK,jmerkow/VTK,SimVascular/VTK,sumedhasingla/VTK,gram526/VTK,mspark93/VTK,gram526/VTK,SimVascular/VTK,mspark93/VTK,mspark93/VTK,SimVascular/VTK