Remove obsolete debug option from configuration fixture

tests/test_config_debug.c

@@ -34,7 +34,6 @@ static const char* config_content =
     "# Debug and logging configuration\n"
     "log_file=/tmp/utun_debug.log\n"
     "debug_level=debug\n"
-    "debug_categories=etcp,ll_queue,memory,traffic\n"
     "enable_timestamp=1\n"
     "enable_function_names=1\n"
     "enable_file_lines=1\n"