[openstreetmap-website] Revised road key and icons for data browser (#1070)

[polarbearing]

The roads from tertiary downwards are missing in the legend, and they were missing in the old-colour legend already. 

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1070#issuecomment-152748164
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