[openstreetmap/openstreetmap-website] Rename internal variable to avoid confusion (#2548)

[Holger Jeromin]

The rename is only a refactoring preventing confusion like in https://github.com/openstreetmap/openstreetmap-website/pull/2521#discussion_r370989660

The variables `to` and `from` are not the same as the properties a few lines below.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2548

-- Commit Summary --

  * rename internal variable

-- File Changes --

    M app/assets/javascripts/index/directions.js (12)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2548.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2548.diff

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