Automatically checks Steam Subscriber Agreement checkboxes
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fix query string matching
added another safeguard that prevents Steam code from unchecking the boxes via JavaScript. The register key page does this if you click "Activate More" after activating a key for example
update to account for new Steam subdomain
added multi buy checkbox
added missing checkbox, and also set the DOM checked attribute just in case
add checkout checkbox
simplified code. I think the checked getter stuff isn't necessary anymore
