Leave overpass result links coloured blue

Closes #47.

This simply leaves the overpass result links as the same blue colour as the nominatim search results. My motivation is that the user needs some visual clue that the list has clickable things in it, it's not just a list of words.

Tom mentioned in #47 that the changeset results include black-text links, hence the motivation for making these ones black. This PR doesn't affect those - so it doesn't create overall consistency but it doesn't reduce overall consistency ;) and as I've already argued, in my own opinion there is a usability reason to have it this way.