[openstreetmap/openstreetmap-website] Map jumps after left sidebar is closed (#1255)

[strump]

Steps to reproduce:

1. Open link https://www.openstreetmap.org/way/140950703
2. Drag the map (this is important!)
3. Close left sidebar
4. Drag the map:

**Actual result:** map jumps to the left when you start dragging;
**Expected result:** map is dragged normally.

![osm_sidebar_bug](https://cloud.githubusercontent.com/assets/720808/16985493/77f3f2aa-4e89-11e6-991f-8351b9442726.gif)

I found two workarounds:

### Workaround 1:
In [leaflet.map.js line #263](https://github.com/openstreetmap/openstreetmap-website/blob/master/app/assets/javascripts/leaflet.map.js#L263) put `animate:true`. I don't know why, but it helps.

### Workaround 2:
In [leaflet.js line #8664](https://github.com/openstreetmap/openstreetmap-website/blob/master/vendor/assets/leaflet/leaflet.js#L8664)
remove assignment `this._el._leaflet_pos = this._newPos`. For some reason, this could help.


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https://github.com/openstreetmap/openstreetmap-website/issues/1255
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