[openstreetmap-website] Update to iD v1.6.3 (#893)

[Tom Hughes]

Something seems to be very wrong. When I start iD all I get is a black square where the map should be. No javascript errors at that point, but lots if I try and pan or zoom in the space where the map should be.

First error is:

```
TypeError: source.validZoom is not a function
render(selection=[[div.layer-layer.background-layer]])iD-e8d8...?body=1 (line 25527)
background(selection=[[div.layer-layer.background-layer]])iD-e8d8...?body=1 (line 25518)
d3_selectionPrototype.call(callback=background(selection))iD-e8d8...?body=1 (line 1372)
background(selection=[[div#supersurface]])iD-e8d8...?body=1 (line 24026)
d3_selectionPrototype.call(callback=background(selection))iD-e8d8...?body=1 (line 1372)
map(selection=[[div#map]])iD-e8d8...?body=1 (line 24935)
d3_selectionPrototype.call(callback=map(selection))iD-e8d8...?body=1 (line 1372)
render(container=[[div#id-container.id-container]])
```

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/893#issuecomment-73754409
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