[openstreetmap/openstreetmap-website] Avoid hand-crafting urls (#1817)

[Andy Allan]

In `app/controllers/diary_entry_controller.rb#rss` there are three links that are "hand-crafted", e.g.

```
@link = "#{SERVER_PROTOCOL}://#{SERVER_URL}/user/#{user.display_name}/diary"
```

These should instead use a helper, such as `url_for`.


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