[openstreetmap/openstreetmap-website] Update colours of landuse icons, add icon for natural=scrub (#2442)

[hikemaniac]

Indeed the colour scheme of OpenStreetMap Carto has changed a lot over the past five years (this is when most of the browse.scss icons were last updated). With this pull request, I am just matching the colour scheme to the latest version of the map stylesheet as this discrepancy is something that confuses me often when I open the browse view. For some of the tags, the difference is more subtle but I decided to update all of them in one go.

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