[openstreetmap/openstreetmap-website] Change subject of note-notification to improve auto-grouping in email-clients (Issue #4047)

[sjvudp]

> We already set `X-Entity-Ref-ID`, `In-Reply-To` and `References` for note comment notifications.

Yes, my mail app ([FairEmail](https://email.faircode.eu/)) does message threading correctly already (for Gmail, BTW), but the subject still lacks the note number. Actually it's even missing in the message body; I can only read it from the URL in the message.

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