Fix variable names

source/App/DecoderApp/DecApp.cpp

source/App/DecoderApp/DecAppCfg.cpp

source/App/DecoderApp/DecAppCfg.h

source/App/EncoderApp/EncApp.cpp

source/App/EncoderApp/EncApp.h

source/App/EncoderApp/EncAppCfg.cpp

source/App/EncoderApp/EncAppCfg.h

source/Lib/CommonLib/Slice.cpp

source/Lib/CommonLib/Slice.h

source/Lib/EncoderLib/EncCfg.h

source/Lib/EncoderLib/EncLib.cpp

source/Lib/EncoderLib/EncTemporalFilter.cpp

source/Lib/EncoderLib/EncTemporalFilter.h

source/Lib/Utilities/VideoIOYuv.cpp

source/Lib/Utilities/VideoIOYuv.h