Find Available PDF: URL normalization skips Atypon PDFs

[AbeJellinek]

e.g.:

https://www.liebertpub.com/doi/full/10.1089/cmb.2009.0238 https://www.tandfonline.com/doi/full/10.1080/01457632.2023.2255811

PDF download URL is the same as the reader URL but with ?download=true, and query strings are ignored, so it gets skipped.