BUG: Fix ConvertAnITKGrayScaleImageToCVMat compare_to_baseline.
BUG: Fix ConvertAnITKGrayScaleImageToCVMat compare_to_baseline.

Use new function syntax.

Change-Id: If8002b3bbabd93dcad364a7a01781ad23716e7ad

InsightSoftwareConsortium/ITKExamples,InsightSoftwareConsortium/ITKExamples,InsightSoftwareConsortium/ITKExamples,InsightSoftwareConsortium/ITKExamples,InsightSoftwareConsortium/ITKExamples