Fix build error in vtkVizInteractorStyle.cpp (Windows/msvc16/x64)

[chr-thien]

Fixes the following build errors when compiling with msvc16 (VS 2019):
vtkVizInteractorStyle.cpp(99): error C2065: 'cout': undeclared identifier
vtkVizInteractorStyle.cpp(121): error C2065: 'cout': undeclared identifier

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