only remove main image (ifd0) orientation tag
only remove main image (ifd0) orientation tag

we were stripping all orientation tags on autorot

see https://github.com/libvips/libvips/issues/1865

lovell/libvips,jcupitt/libvips,jcupitt/libvips,lovell/libvips,lovell/libvips,jcupitt/libvips,jcupitt/libvips,lovell/libvips