[openstreetmap-website] using sprite.svg for high dpi devices (#1055)

[Holger Jeromin]

The first line `<svg xmlns="http://www.w3.org/2000/svg" width="300" height="200">` has the same quality of dimension as a png.
IE<9 should ignore the background with the two entries, or NOT choose the svg. Both is good.

yes, safari <=4. But caniuse says that has 0.2% usage... Perhaps piwik can help.

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https://github.com/openstreetmap/openstreetmap-website/pull/1055#issuecomment-139865839
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