[openstreetmap-website] Only display the last requested route (#913)

[Tom Hughes]

Well slow on the order of some seconds sure, but you still have to be quite quick to do another route before it finishes ;-)

I resorted to doing London to Beijing and then London to somewhere nearby...

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/913#issuecomment-76240986
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