Bug#985887: gscan2pdf: saves b&w scanned pages in inverted mode

[Jeff]

tags 985887 patch
thanks


I've cherry-picked enough of this patch to fix this from master at

https://github.com/PhilterPaper/Perl-PDF-Builder/commit/d03b59847ecfbf3c7c31b8c1901d3878dba08040#diff-44803d0b8089ee5eb36d750b5be96b6038d4f32687973371d4c67310afc81ae1

i.e. the author should be Phil Perry, who is also the upstream maintainer.
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