Update config_factory.gd

Author: brandonlamb

addons/godot-screen-manager/config_factory.gd

@@ -23,4 +23,6 @@ func create():
 		print("Screen config: key=", key)
 		screens[key] = str(config_file.get_value("screens", key))
 
-	return screens
+	config_file.close()
+	
+	return screens