WERD_RES: Fix uninitialized member variable
WERD_RES: Fix uninitialized member variable

Credit to OSS-Fuzz which reported this issue:

    pageres.cpp:1143:7: runtime error: load of value 249, which is not a valid value for type 'bool'
	    #0 0x6ba560 in WERD_RES::Clear() tesseract/src/ccstruct/pageres.cpp:1143:7
	    #1 0x6b9fd1 in WERD_RES::operator=(WERD_RES const&) tesseract/src/ccstruct/pageres.cpp:193:3
	    #2 0x49a9ad in WERD_RES::WERD_RES(WERD_RES const&) tesseract/src/ccstruct/pageres.h:356:11

See https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=13707.

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

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