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Fix PDF417 with binary content not producing any output with ZXing 2.0

Volker Krause requested to merge work/vkrause/kf6-cherry-pick-pdf417-binary-data-fix into master

There's two issues here:

  • The QByteArray to std::wstring conversion has to use unsigned bytes, the previous code did an implicit conversion to int producing wrong results for value above 127.
  • We now have to explicitly specify we are inputting binary data.

See also https://github.com/zxing-cpp/zxing-cpp/pull/557.

This fixes for example domestic Hungarian railway ticket barcodes not being shown in KDE Itinerary anymore.

(cherry picked from commit 6b234bc7)

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