Sky lights data saving (optimization)

src/files/settings_io.cpp

@@ -38,6 +38,7 @@ toml::Wrapper create_wrapper(EngineSettings& settings) {
 	toml::Section& debug = wrapper.add("debug");
 	debug.add("generator-test-mode", &settings.debug.generatorTestMode);
 	debug.add("show-chunk-borders", &settings.debug.showChunkBorders);
+	debug.add("do-write-lights", &settings.debug.doWriteLights);
 	return wrapper;
 }