Remove TIFF tag OSUBFILETYPE when saving using libtiff #7893
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Resolves #7892
The issue has found a TIFF image with tag 255, OSUBFILETYPE, that fails to save using libtiff.
It is described at https://www.awaresystems.be/imaging/tiff/tifftags/subfiletype.html as 'deprecated', and TiffTags.py says that we don't support it.
Pillow/src/PIL/TiffTags.py
Line 536 in ca97370
So this PR simply removes it when saving using libtiff.