Update MixtapeSettingsSubState.hx

Author: Z11Coding

source/options/MixtapeSettingsSubState.hx

@@ -248,7 +248,7 @@ class MixtapeSettingsSubState extends BaseOptionsMenu
 			STRING, 
 			["Light", "Dark"]);
 		option.displayFormat = '< %v >';
-		onChange = function() Achievements.unlock('much_better');
+		option.onChange = function() Achievements.unlock('much_better');
 		addOption(option);
 
 		var option:Option = new Option('---MISC.---',