COMP: fix test data root definition for examples

Examples/BasicFilters/test/CMakeLists.txt

Examples/ChangeDetection/test/CMakeLists.txt

Examples/Classification/test/CMakeLists.txt

Examples/DataRepresentation/Image/test/CMakeLists.txt

Examples/DisparityMap/test/CMakeLists.txt

Examples/FeatureExtraction/test/CMakeLists.txt

Examples/Filtering/test/CMakeLists.txt

Examples/Fusion/test/CMakeLists.txt

Examples/Hyperspectral/test/CMakeLists.txt

Examples/IO/test/CMakeLists.txt

Examples/Iterators/test/CMakeLists.txt

Examples/Learning/test/CMakeLists.txt

Examples/Markov/test/CMakeLists.txt

Examples/MultiScale/test/CMakeLists.txt

Examples/OBIA/test/CMakeLists.txt

Examples/Patented/test/CMakeLists.txt

Examples/Projections/test/CMakeLists.txt

Examples/Radiometry/test/CMakeLists.txt

Examples/Registration/test/CMakeLists.txt

Examples/Segmentation/test/CMakeLists.txt