removing invalid attribute based on c1e1ef80e

[Markus Mohrhard]

Hey,

so going through the calc list of invalid documents I found that you
documented in c1e1ef80e that we should remove the invalid attribute in a
few years and make the exported files valid through that.

I suppose that 3.5 years count as a enough time and we can safely remove
that attribute now.

If there are no objections I'm going to remove that soon.

Regards,
Markus
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