Remove explicit parallel filters linkage

!9 (merged) explicitly links vtkFiltersParallelDIY2 to vtkSurface if the former target exists. This avoids a downstream app compilation error when VTK is built with MPI support enabled. This seems like something CMake should implicitly handle, but VTK is notorious for its linking interface not following "standard" CMake convention.

This explicit linkage should be reevaluated at a later date to see if it's still required in later versions of VTK.