Fix text box width/hight calculation (addition)
Fix text box width/hight calculation (addition)

This occurrence was should have been included in commit 29d971e
but was overlooked by error.

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