[openstreetmap/openstreetmap-website] Add button styles to edit-diary-entry-button (#3019)

[Tobias]

The tests are failing at 

```
Failure:
DiaryEntriesControllerTest#test_edit [/home/runner/work/openstreetmap-website/openstreetmap-website/test/controllers/diary_entries_controller_test.rb:321]:
Expected exactly 1 element matching "a[href='/user/User%202002/diary/16/edit']", found 0..
Expected: 1
  Actual: 0

rails test test/controllers/diary_entries_controller_test.rb:250
```

I wasn't able to get the dev env running again, yet, so I cannot look into it ATM.

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