Codechange: Set VehicleType's base type to byte instead of using VehicleTypeByte

src/smallmap_gui.cpp

@@ -566,7 +566,7 @@ static inline uint32 GetSmallMapOwnerPixels(TileIndex tile, TileType t)
 	return MKCOLOUR_XXXX(_legend_land_owners[_company_to_list_pos[o]].colour);
 }
 
-/** Vehicle colours in #SMT_VEHICLES mode. Indexed by #VehicleTypeByte. */
+/** Vehicle colours in #SMT_VEHICLES mode. Indexed by #VehicleType. */
 static const byte _vehicle_type_colours[6] = {
 	PC_RED, PC_YELLOW, PC_LIGHT_BLUE, PC_WHITE, PC_BLACK, PC_RED
 };