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

[Peter]

`jsonp` should be avoided as error reporting is not always possible. The necessary magic should be done from jquery automatically. (is there a possibility to test this on an openstreetmap.org domain before going production?)
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/1872

-- Commit Summary --

  * Avoid using jsonp

-- File Changes --

    M app/assets/javascripts/index/directions/graphhopper.js (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/1872.patch
https://github.com/openstreetmap/openstreetmap-website/pull/1872.diff

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