[openstreetmap-website] Retain editor/location URL parameters throughout user signup (#400)

[John Firebaugh]

This is probably due to some of my changes on the welcome branch -- I changed it to unconditionally redirect to /welcome after confirmation.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/400#issuecomment-21898228
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