[openstreetmap-website] Fixes #258 (Fix gap for iconless nodes in history view) (#267)

[Tom Hughes]

Please don't replace `image-url()` with `url()` as it will stop the assets pipeline being used to load those images.

The `image-url()` will be replaced with a normal `url()` by the time the CSS reaches the client, having been compiled down by the assets pipeline.

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