Update SerenityOS JBIG2 test files

https://github.com/SerenityOS/serenity/compare/4429f0c52ecac138b...d58a66717904a01a4

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

Picks up tests for refinement of strip-refined symbols in both
arithmetic and huffman mode, 16- and 32-bit segment numbers, inner
combination op for halftone regions, and makes the existing tests for
external combination operators and text region inner combination
operators more thorough.

PDFium passes all these tests. Refinement of strip-refined symbols in
huffman mode was fixed in
https://pdfium-review.googlesource.com/c/pdfium/+/140430; this adds a
test for that.

Bug: 42271957,472139308
Change-Id: I88c4a67913a692032317ba6e598941c20da07a71
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium_tests/+/140630
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Nico Weber <thakis@google.com>
16 files changed