[openstreetmap/openstreetmap-website] Allow closing of the sidebar while it is still loading (#1757)

[hikemaniac]

In some cases it would be desirable to be able to close the sidebar even when it is still loading.

![loading sidebar](https://user-images.githubusercontent.com/31667811/36276671-eb6031b6-128e-11e8-937c-4c1fc0f64a56.gif)

Would it be possible to implement this feature?

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