Fix for receipt QRCode #79
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The QRCode data generated by the QRCode ReceiptItem, at least for my printer (GoojPRT PT-210), doesn't seem to generate anything, only some characters of the sequence.
After comparing with some references like https://stackoverflow.com/a/29221432/1356575 I fixed the code and now it seems to print.
If you could test it in more printers to check if its ok feel free to merge it on the main branch.
Best regards
João Colaço