Fix SIGSEGV on vtkCompositeDataProbeFilter() (#17690)
vtkDataSetAttributesFieldList::vtkInternals.NumberOfInputs was initialized to be -1, which causes UnionFieldList to pass wrong argument to PreExtendForUnion. It is now fixed to be 0.
vtkDataSetAttributesFieldList::vtkInternals.NumberOfInputs was initialized to be -1, which causes UnionFieldList to pass wrong argument to PreExtendForUnion. It is now fixed to be 0.