[openstreetmap/openstreetmap-website] Avoid using jsonp for GraphHopper (#1872)

[Tom Hughes]

Well as far as I know we were only using jsonp because XHR wasn't possible - we certainly prefer not to use it. Is there a suitable cross domain policy in place that will allow access?

Also you will need to update https://github.com/openstreetmap/openstreetmap-website/blob/master/app/controllers/application_controller.rb#L411 to move graphopper from `script_src` to `connect_src`.

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