BUG: Fix failing vtkMRMLStreamingVolumeNode test and memory leak
- vtkMRMLStreamingVolumeNodeTest1.cxx was previously failing due to missing scene
- Fixed Memory leak vtkStreamingVolumeCodec within vtkMRMLStreamingVolumeNode where vtkSmartPointer::Take was not used with the codec factory method.
- Fix compile warning for unused parameter in vtkRawRGBVolumeCodec