Update the link location for 'issue3666.pdf' to point to the Internet Archive

Note that despite the new file having a different hash than the the current one, it does render *identically* and most importantly it uses *the same* JBIG2 functionality.

For reference, please see issue 3666 and PR 3738.

test/pdfs/issue3666.pdf.link

@@ -1,2 +1 @@
-http://www.nfbc.com/Assets/Maps/716NiagaraWineTrail.pdf
+http://web.archive.org/web/20160111201835/https://nfbc.com/Assets/Documents/Cuesheet/716NiagaraWineTrail_opt.pdf
-

test/test_manifest.json

@@ -2534,7 +2534,7 @@
     },
     {  "id": "issue3666",
        "file": "pdfs/issue3666.pdf",
-       "md5": "c2156a34b9634b174556910732ab9df0",
+       "md5": "cbcaf533d8a4e825d7f12cb4f137babd",
        "rounds": 1,
        "link": true,
        "firstPage": 1,