[openstreetmap/openstreetmap-website] Move abbr style from border to text-decoration (#1772)

[Holger Jeromin]

The browser stylesheets (at least chrome and firefox) uses `text-decoration: underline dotted;` for `abbr` styling. So our border-bottom leads to a double under line.
Moving to the same CSS property prevents this.

fixes #1771 
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/1772

-- Commit Summary --

  * Move abbr style from border to text-decoration

-- File Changes --

    M app/assets/stylesheets/common.scss (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/1772.patch
https://github.com/openstreetmap/openstreetmap-website/pull/1772.diff

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