[openstreetmap-website] allow commenting a closed note (#864)

[kerosin]

Good about this: anonymous users can still participate, although the Note is already closed (they can't reopen)

On the other hand closed Notes that are older than 7 days are hidden on the main site. So there might be discussions behind closed doors that nobody notices expect the users which already have been  participating (email notification).

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/864#issuecomment-75392459
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