[openstreetmap-website] Restore correct link behavior with modifier keys (#599)

[John Firebaugh]

Fixes #562
You can merge this Pull Request by running:

  git pull https://github.com/jfirebaugh/openstreetmap-website 562

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/599

-- Commit Summary --

  * Restore correct link behavior with modifier keys

-- File Changes --

    M app/assets/javascripts/index.js (15)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/599.patch
https://github.com/openstreetmap/openstreetmap-website/pull/599.diff
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