Fix violation of cv::BackgroundSubtractor API by previous implementation.

Src/Model/BioTrackerTrackingAlgorithm.cpp

Src/Model/TrackerParameter.h

...mageProcessor/preprocessor/CustomBackgroundSubtractor.cpp

.../imageProcessor/preprocessor/CustomBackgroundSubtractor.h

...gorithm/imageProcessor/preprocessor/ImagePreProcessor.cpp

...Algorithm/imageProcessor/preprocessor/ImagePreProcessor.h

Src/View/TrackerParameterView.cpp

Src/View/TrackerParameterView.ui