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

[Tom Hughes]

I've applied a more comprehensive fix in 629ae62b730409b46de6abc8c5166155841b5a00 that ensures that the session has a valid token for the user.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1011#issuecomment-123026533
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