LibVideo: Parameterize parsing the default UV prediction mode for VP9

Author: https://github.com/Zaggy1024
Commit: 1b66aa3cad
Pull-request: https://github.com/SerenityOS/serenity/pull/15972
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/awesomekling ✅

Userland/Libraries/LibVideo/VP9/Parser.cpp

@@ -1057,7 +1057,7 @@ DecoderErrorOr<void> Parser::intra_frame_mode_info()
         }
         m_y_mode = m_default_intra_mode;
     }
-    m_uv_mode = TRY_READ(m_tree_parser->parse_tree<PredictionMode>(SyntaxElementType::DefaultUVMode));
+    m_uv_mode = TRY_READ(TreeParser::parse_default_uv_mode(*m_bit_stream, *m_probability_tables, m_y_mode));
     return {};
 }