noise profile: read Hi/Lo iso values, refs #11580, fixes #11842 #1612
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This fixes "./gen-profile: 1: eval: Bad substitution" error
during noise profile calculation with same nikon images.
Tested with images from #11580, fix is copied from #11842.
exiv2 reports
{{{
$ exiv2 -g "Exif.NikonIi.ISO" -Pt DSC_1083.NEF
79
Lo 0.3
79
Lo 0.3
}}}
which can not be parsed correct with current script.
79 seems to be the correct iso value as it is reported from exiv2
without key argument.
{{{
$ exiv2 DSC_1083.NEF | grep ISO
ISO speed : 79
}}}