[openstreetmap-website] Adjust colouring of icon when sharing with position to avoid route icon conflict (#929)

[danstowell]

(BTW, since red-green colourblindness is the most common colourblindness, it might be better if we changed the routing "startpoint" rather than changing the shared-map-pointer - i.e. so that colourblind people can tell which way the route is going.)

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/929#issuecomment-78864019
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