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JBIG2Reader: Fix binary constant

Oliver Sander requested to merge sander/poppler:fix-binary-constant-in-jbig2reader into master

When comparing the file JBIG2Reader.cc with what is in xpdf-4.02, I noticed that a particular constant used in the method readGenericBitmap differs in poppler and xpdf. I have no idea what that constant is good for, but in a comment both poppler and xpdf give the binary representation of that constant. That binary number is identical in poppler and xpdf, and it matches the value in xpdf, but is off-by-one in poppler. This leads me to believe that the value in poppler wrong, possibly a typo.

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