Update SerenityOS JBIG2 test files

https://github.com/SerenityOS/serenity/compare/cb4230b21de9bbab3...1c65cbcac48d8399c

Really only two JBIG2 changes:
https://github.com/SerenityOS/serenity/commit/5d8baf7691e6
https://github.com/SerenityOS/serenity/commit/b9449f58243d

PDFium passes these expanded tests already.

Bug: 42271957
Change-Id: I18d859d2ca80796853948adf182aece19023ea40
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium_tests/+/139030
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Nico Weber <thakis@google.com>