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

[Erik Johansson]

If you make two routes quickly it's not given which of these will en up being displayed.

1. make a long route which takes 10 seconds to finish (I tried with mapquest )
2. make a short route

result: 

1. the short route will display almost directly
2. 5 seconds pass
3. the long route will be displayed 
4. the end points of the short route will be displayed

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