Update SerenityOS JBIG2 test files

https://github.com/SerenityOS/serenity/compare/b7418e74d3bce24b59f1b...fc2e3fdc5f2ce926cdf14

Not sure if there's a way to limit the comparison to just the
Tests/LibGfx/test-inputs/jbig2/json folder:

https://github.com/SerenityOS/serenity/commits/master/Tests/LibGfx/test-inputs/jbig2/json

Contains, among other things, a test for crbug.com/461414279.

Bug: 461414279,42271957
Change-Id: I097dbb36b947290d91f2d37d8e40e04af7dc5ffa
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium_tests/+/138430
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Nico Weber <thakis@google.com>