[openstreetmap/openstreetmap-website] Fix double underline on abbr content (#1771)

[Aaron Lidman]

<img width="399" alt="screen shot 2018-02-27 at 11 42 26 am" src="https://user-images.githubusercontent.com/58878/36751025-d5cd4590-1bb3-11e8-9996-6b9161eb0886.png">

Most browsers have added default `text-transform` styling to abbr content in the last few years, which conflicts with the existing border style.

The existing `border-bottom` should be removed in favor of the browser default, which is effectively the same styling we currently have.

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