Tests/JBIG2: Add a test for symbol and text segment decoding

Author: https://github.com/nico
Commit: 259a84ddac
Pull-request: https://github.com/SerenityOS/serenity/pull/23661
Reviewed-by: https://github.com/trflynn89

Tests/LibGfx/TestImageDecoder.cpp

@@ -356,6 +356,7 @@ TEST_CASE(test_jbig2_decode)
     Array test_inputs = {
         TEST_INPUT("jbig2/bitmap.jbig2"sv),
         TEST_INPUT("jbig2/bitmap-tpgdon.jbig2"sv),
+        TEST_INPUT("jbig2/bitmap-symbol.jbig2"sv),
     };
 
     for (auto test_input : test_inputs) {