Tests/LibGfx: Add a jbig2 file using refinement in the symbol segment

This adds a test for the code added in #23710.

I created this file using `jbig2` (see below for details), but as
usual it required a bunch of changes to it to make it actually produce
spec-compliant output. See the PR adding this image for my local diff.

I created the test image file by running this shell script with
`jbig2` tweaked as described above:

    #!/bin/bash

    set -eu

    S=Tests/LibGfx/test-inputs/bmp/bitmap.bmp

    # See make-symbol-jbig.sh (the script in #23659) for the general
    # setup and some comments. See also make-symbol-textrefine.sh (in
    # #23713).
    #
    # `-Ref` takes 5 arguments:
    # 1. The symbol ID of this symbol (like after a `-Simple`)
    # 2. A bmp file that the base symbol gets refined to
    # 3. The ID of the base symbol
    # 4. dx, dy
    cat << EOF > jbig2-symbol-symbolrefine.ini
    -sym -Seg 1
    -sym -file -numClass -HeightClass 3 -WidthClass 1
    -sym -file -numSymbol 3
    -sym -file -Height 250
    -sym -file -Width 120 -Simple 0 mouth-1bpp.bmp
    -sym -file -EndOfHeightClass
    -sym -file -Height 100
    -sym -file -Width 100 -Simple 1 nose-1bpp.bmp
    -sym -file -EndOfHeightClass
    -sym -file -Height 30
    -sym -file -Width 30 -Simple 2 top_eye-1bpp.bmp
    -sym -file -EndOfHeightClass
    -sym -Param -Huff_DH 0
    -sym -Param -Huff_DW 0

    -sym -Seg 2
    -sym -file -numClass -HeightClass 1 -WidthClass 1
    -sym -file -numSymbol 1
    -sym -file -Height 30
    -sym -file -Width 30 -Ref 3 bottom_eye-1bpp.bmp 2 0 0
    -sym -file -EndOfHeightClass
    -sym -Param -Huff_DH 0
    -sym -Param -Huff_DW 0
    -sym -Param -RefTemplate 1

    -txt -Seg 3
    -txt -Param -numInst 4
        -ID 2 108 50 -ID 3 265 60 -ID 1 100 135 -ID 0 70 232
    -txt -Param -RefCorner 1
    -txt -Param -Xlocation 0
    -txt -Param -Ylocation 0
    -txt -Param -W 399
    -txt -Param -H 400
    EOF

    J=$HOME/Downloads/T-REC-T.88-201808-I\!\!SOFT-ZST-E/Software
    J=$J/JBIG2_SampleSoftware-A20180829/source/jbig2

    $J -i "${S%.bmp}" -f bmp -o symbol-symbolrefine -F jb2 \
        -ini jbig2-symbol-symbolrefine.ini

Tests/LibGfx/TestImageDecoder.cpp

@@ -365,6 +365,7 @@ TEST_CASE(test_jbig2_decode)
         TEST_INPUT("jbig2/bitmap-template3-tpgdon.jbig2"sv),
         TEST_INPUT("jbig2/bitmap-symbol.jbig2"sv),
         TEST_INPUT("jbig2/bitmap-symbol-textrefine.jbig2"sv),
+        TEST_INPUT("jbig2/bitmap-symbol-symbolrefine.jbig2"sv),
     };
 
     for (auto test_input : test_inputs) {