fix config_defaults using wrong property

Author: ithinkandicode

addons/mod_loader/mod_loader.gd

@@ -497,7 +497,7 @@ func get_mod_config(mod_id:String = "", key:String = "")->Dictionary:
 	# Mod ID is valid
 	if error_num == 0:
 		var config_data = mod_data[mod_id].config
-		defaults = mod_data[mod_id].mod_manifest.extra.godot.config_defaults
+		defaults = mod_data[mod_id].manifest.config_defaults
 
 		# No custom JSON file
 		if config_data.size() == 0: