<p>Reenable them when returning to high zoom in the same session.</p>

<p>Fixes <a href="https://github.com/openstreetmap/openstreetmap-website/issues/592" class="issue-link" title="Layers - it isn't possible to untick the "Map Data" box if zoomed out">#592</a></p>

<hr>

<h4>You can merge this Pull Request by running</h4>
<pre>  git pull https://github.com/jfirebaugh/openstreetmap-website 592</pre>
<p>Or view, comment on, or merge it at:</p>
<p>  <a href='https://github.com/openstreetmap/openstreetmap-website/pull/602'>https://github.com/openstreetmap/openstreetmap-website/pull/602</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Auto-uncheck the data and notes layers at low zoom</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/602/files#diff-0">app/assets/javascripts/leaflet.layers.js</a>
    (17)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/602.patch'>https://github.com/openstreetmap/openstreetmap-website/pull/602.patch</a></li>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/602.diff'>https://github.com/openstreetmap/openstreetmap-website/pull/602.diff</a></li>
</ul>