Fix typo that prevented reading of all possible Exif tags in TIFF files. (1625)
Fix typo that prevented reading of all possible Exif tags in TIFF files. (1625)

Obvious cut and paste error. Spotted by Frédéric Devernay.

Fixes #1624

lgritz/oiio,OpenImageIO/oiio,lgritz/oiio,OpenImageIO/oiio,lgritz/oiio,lgritz/oiio,OpenImageIO/oiio,OpenImageIO/oiio