Change: Available railtypes is always calculated on load, so no need to load value for old savegames (#6782)

src/company_base.h

@@ -67,8 +67,6 @@ struct CompanyProperties {
 
 	byte colour;                     ///< Company colour.
 
-	RailTypes avail_railtypes;       ///< Rail types available to the company.
-
 	byte block_preview;              ///< Number of quarters that the company is not allowed to get new exclusive engine previews (see CompaniesGenStatistics).
 
 	TileIndex location_of_HQ;        ///< Northern tile of HQ; #INVALID_TILE when there is none.
@@ -112,6 +110,7 @@ struct Company : CompanyPool::PoolItem<&_company_pool>, CompanyProperties {
 	~Company();
 
 	Livery livery[LS_END];
+	RailTypes avail_railtypes;         ///< Rail types available to this company.
 	RoadTypes avail_roadtypes;         ///< Road types available to this company.
 
 	class AIInstance *ai_instance;