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

[Bryan Housel]

Thanks @tomhughes...
It looks like the imagery sources weren't set...  Looking at our own code, it seems like they need to get set before starting the ui.

@jfirebaugh : does [this change](https://github.com/openstreetmap/iD/commit/dd0e08b244b6f36659f15a29fa26ebe6321bc664#diff-f3c8e37dd0a73713fe739364dd4bcd98R68)  necessitate an upstream change too for embedded iD?


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