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

[mmd]

Technically speaking this seems to be working ok now. However, the list of diaries UX seems a bit inconsistent to me now:

![pr3019](https://user-images.githubusercontent.com/5842757/103210718-d0676300-4906-11eb-841a-4d362f4aaa44.png)


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