add Flickr API keys on upgrade bookmarklet screen

Hi,

I noticed a bug that causes the bookmarklet code on the homepage and bookmarklet code on the upgrade bookmarklet screen to be different. It happens because the `bookmarklet_vars` aren't set in the upgrade bookmarklet view (a regular template view) which causes collecting of Flickr images to fail because of the missing API keys. 

I've attached a fix for that bug.