STYLE: Correcting __otb in ifdef

Code/BasicFilters/otbGaborFilterGenerator.h

Code/BasicFilters/otbGaborFilterGenerator.txx

Code/BasicFilters/otbMeanShiftImageFilter.h

Code/BasicFilters/otbMeanShiftImageFilter.txx

Code/BasicFilters/otbMeanShiftImageFilterBase.h

Code/BasicFilters/otbMeanShiftImageFilterBase.txx

Code/BasicFilters/otbMeanShiftVectorImageFilter.h

Code/BasicFilters/otbMeanShiftVectorImageFilter.txx

Code/BasicFilters/otbOverlapSaveConvolutionImageFilter.txx

Code/SARPolarimetry/otbPolarimetricData.h