Codechange: Use Map::Iterate() to iterate tiles

src/saveload/company_sl.cpp

@@ -106,7 +106,7 @@ void AfterLoadCompanyStats()
 	}
 
 	Company *c;
-	for (TileIndex tile = 0; tile < Map::Size(); tile++) {
+	for (const auto tile : Map::Iterate()) {
 		switch (GetTileType(tile)) {
 			case MP_RAILWAY:
 				c = Company::GetIfValid(GetTileOwner(tile));