[openstreetmap-website] Support background hash parameter for iD (#444)

[Tormi Tabor]

Reopening. background=custom arg does work on openstreetmap.us, but doesn't on openstreetmap.org. Tested today.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/444#issuecomment-26494688
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