[openstreetmap-website] Do not re-send confirmation email (nor leak email address) if user already active. Fixes #1010 (#1011)

[Tom Hughes]

Well it doesn't actually fix the problem fully - you can still discover the address for any user that isn't active yet!

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1011#issuecomment-122895289
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