[openstreetmap/openstreetmap-website] Allow closing side panels even when not scrolled all the way back to the top (#2174)

[積丹尼 Dan Jacobson]

Here we see how other sites employ a side arrow "<" method instead.
![df1](https://user-images.githubusercontent.com/1230959/54266554-90f54880-45b2-11e9-8e21-7d6d30ad1377.jpg)


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