[openstreetmap-website] Restore support for #layers=X with no map parameter (#609)

[John Firebaugh]

https://trac.openstreetmap.org/ticket/5056
You can merge this Pull Request by running:

  git pull https://github.com/jfirebaugh/openstreetmap-website 5056

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

  https://github.com/openstreetmap/openstreetmap-website/pull/609

-- Commit Summary --

  * Restore support for #layers=X with no map parameter

-- File Changes --

    M app/assets/javascripts/leaflet.map.js.erb (5)
    M app/assets/javascripts/osm.js.erb (38)
    M app/assets/javascripts/router.js (12)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/609.patch
https://github.com/openstreetmap/openstreetmap-website/pull/609.diff
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