Fix vtkImageStencilData::ChangeExtent() for X
The code for ChangeExtent would only call SetExtent() if the Y or Z values had changed. If the only change was to X, then Extent would not be modified.
Closes #17402 (closed)
The code for ChangeExtent would only call SetExtent() if the Y or Z values had changed. If the only change was to X, then Extent would not be modified.
Closes #17402 (closed)