classify: Remove unused local function
classify: Remove unused local function

This fixes a compiler warning:

classify/trainingsampleset.cpp:510:13: warning:
 'Pix* tesseract::DebugSample(const UNICHARSET&, tesseract::TrainingSample*)'
 defined but not used [-Wunused-function]

Signed-off-by: Stefan Weil <8d4c780fcfdc41841e5070f4c43da8958ba6aec0@weilnetz.de>

tesseract-ocr/tesseract,amitdo/tesseract,jbarlow83/tesseract,jbarlow83/tesseract,amitdo/tesseract,jbarlow83/tesseract,stweil/tesseract,amitdo/tesseract,stweil/tesseract,tesseract-ocr/tesseract,tesseract-ocr/tesseract,UB-Mannheim/tesseract,amitdo/tesseract,stweil/tesseract,stweil/tesseract,UB-Mannheim/tesseract,UB-Mannheim/tesseract,tesseract-ocr/tesseract,jbarlow83/tesseract,UB-Mannheim/tesseract,tesseract-ocr/tesseract,stweil/tesseract,jbarlow83/tesseract,amitdo/tesseract,UB-Mannheim/tesseract