WERD_RES: Remove comparisons which are constant
WERD_RES: Remove comparisons which are constant

This fixes warnings from LGTM:

Comparison is always false because id >= 0.
Comparison is always true because mirrored >= 1.
Comparison is always false because id >= 0.

INVALID_UNICHAR_ID is -1, so the warnings are correct.

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

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