add map_file to schema

data/schema/core/addons.cfg

@@ -286,6 +286,7 @@
 	{SIMPLE_KEY next_scenario string}
 	{SIMPLE_KEY name t_string}
 	{SIMPLE_KEY map_data map_data}
+	{SIMPLE_KEY map_file path}
 	{DEFAULT_KEY turns turns unlimited}
 	{DEFAULT_KEY turn_at int 1}
 	{DEFAULT_KEY random_start_time bool,int_list no}