Fix: add error 451 alongside error 403 for "blocked" status to scripts

[Owyn]

Describe your issue

451 means that content is not available due to legal reasons. Another way of saying "geo-locked".

iptv-org/iptv#3883 (comment)
iptv-org/iptv#6839 (review)

[Owyn]

does bot currently auto-delete such geo-blocked channels after a while of them being marked as 'error' ?

but anyway, they don't even get into any public (language \ thematic) playlists atm, do them?

[freearhey]

does bot currently auto-delete such geo-blocked channels after a while of them being marked as 'error' ?

no, bot does not delete links

but anyway, they don't even get into any public (language \ thematic) playlists atm, do them?

yes, if a link has status="error" it does not get into the public playlists

[freearhey]

Done in #7476