Greasy Fork镜像

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