[openstreetmap-website] Auto-uncheck the data and notes layers at low zoom (#602)

[John Firebaugh]

Reenable them when returning to high zoom in the same session.

Fixes #592
You can merge this Pull Request by running:

  git pull https://github.com/jfirebaugh/openstreetmap-website 592

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

  https://github.com/openstreetmap/openstreetmap-website/pull/602

-- Commit Summary --

  * Auto-uncheck the data and notes layers at low zoom

-- File Changes --

    M app/assets/javascripts/leaflet.layers.js (17)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/602.patch
https://github.com/openstreetmap/openstreetmap-website/pull/602.diff
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