Update of ResampleDTIVolume tests

2 tests were failing or had been commented out for ResampleDTIVolume (CLI).
-itkTestMainExtendedScalarTest: Test data was missing since Slicer4 (test was still pointing where data was in Slicer3). The baseline image was added to the project and the test was updated.
-ResampleDTIVolumeBSplineInterpolationTest: Test was not passing anymore because BSpline interpolation algorithm has been updated. Test has been updated.

https://github.com/fbudin69500/Slicer/compare/c42c0a1ec3614674ccd0ed24d58bb5bd8d2f7bb8%E2%80%A68e46637d5dc0e7458f3e8a332669815c95c8819c