UNICHARSET: Add missing initialization

[stweil]

The member variable default_sid_ was used without being initialized.

Valgrind report for tesseract --oem 1 hello.png hello:

Conditional jump or move depends on uninitialised value(s)
   at 0x14352E: BITS16::set_bit(unsigned char, unsigned char) (bits16.h:50)
   by 0x143E27: WERD::set_flag(WERD_FLAGS, unsigned char) (werd.h:129)
   by 0x27D053: WERD_RES::SetupWordScript(UNICHARSET const&) (pageres.cpp:381)
   by 0x27CAFD: WERD_RES::SetupForRecognition(UNICHARSET const&, tesseract::Tesseract*, Pix*, int, TBOX const*, bool, bool, bool, ROW*, BLOCK const*) (pageres.cpp:316)
   by 0x145903: tesseract::Tesseract::SetupWordPassN(int, tesseract::WordData*) (control.cpp:182)
   by 0x145780: tesseract::Tesseract::SetupAllWordsPassN(int, TBOX const*, char const*, PAGE_RES*, GenericVector<tesseract::WordData>*) (control.cpp:168)
   by 0x146293: tesseract::Tesseract::recog_all_words(PAGE_RES*, ETEXT_DESC*, TBOX const*, char const*, int) (control.cpp:336)
   by 0x12F356: tesseract::TessBaseAPI::Recognize(ETEXT_DESC*) (baseapi.cpp:878)
   by 0x13036D: tesseract::TessBaseAPI::ProcessPage(Pix*, int, char const*, char const*, int, tesseract::TessResultRenderer*) (baseapi.cpp:1184)
   by 0x13014A: tesseract::TessBaseAPI::ProcessPagesInternal(char const*, char const*, int, tesseract::TessResultRenderer*) (baseapi.cpp:1140)
   by 0x12FBCE: tesseract::TessBaseAPI::ProcessPages(char const*, char const*, int, tesseract::TessResultRenderer*) (baseapi.cpp:1040)
   by 0x12C3DF: main (tesseractmain.cpp:515)
 Uninitialised value was created by a heap allocation
   at 0x4C2C21F: operator new(unsigned long) (vg_replace_malloc.c:334)
   by 0x12D88B: tesseract::TessBaseAPI::Init(char const*, int, char const*, tesseract::OcrEngineMode, char**, int, GenericVector<STRING> const*, GenericVector<STRING> const*, bool, bool (*)(STRING const&, GenericVector<char>*)) (baseapi.cpp:320)
   by 0x12D6DA: tesseract::TessBaseAPI::Init(char const*, char const*, tesseract::OcrEngineMode, char**, int, GenericVector<STRING> const*, GenericVector<STRING> const*, bool) (baseapi.cpp:284)
   by 0x12C088: main (tesseractmain.cpp:440)

Signed-off-by: Stefan Weil [email protected]