[openstreetmap/openstreetmap-website] Many repeated links in Changeset comment notifications (#2376)

[積丹尼 Dan Jacobson]

Examining an average changeset comment notification,
```
From: OpenStreetMap <web at noreply.openstreetmap.org>
Subject: [OpenStreetMap] Supaplex has commented on one of your changesets
```
The HTML portion has many repeated links,
```
$ mech-dump --links x.html | sort | uniq -c | sort -nr
      3 https://www.openstreetmap.org/
      2 https://www.openstreetmap.org/user/Supaplex
      2 https://www.openstreetmap.org/changeset/74881499
      1 https://osmcha.mapbox.com/changesets/74881499
```
Perhaps each should just be given once.

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https://github.com/openstreetmap/openstreetmap-website/issues/2376
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