[openstreetmap-website] Track Foursquare edit button referers (#407)

[Alex Barth]

I asked Foursquare to set up pk_campaign=foursquare-edit. Thanks for helping me think through this.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/407#issuecomment-22026775
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