Sync map types with pokefirered

include/constants/map_types.h

@@ -1,14 +1,14 @@
 #ifndef GUARD_CONSTANTS_MAP_TYPES_H
 #define GUARD_CONSTANTS_MAP_TYPES_H
 
-#define MAP_TYPE_UNUSED_1    0
+#define MAP_TYPE_NONE        0
 #define MAP_TYPE_TOWN        1
 #define MAP_TYPE_CITY        2
 #define MAP_TYPE_ROUTE       3
 #define MAP_TYPE_UNDERGROUND 4
 #define MAP_TYPE_UNDERWATER  5
 #define MAP_TYPE_OCEAN_ROUTE 6
-#define MAP_TYPE_UNUSED_2    7
+#define MAP_TYPE_UNKNOWN     7 // Not used by any map.
 #define MAP_TYPE_INDOOR      8
 #define MAP_TYPE_SECRET_BASE 9