Change: [Script] Move GSStation::GetOwner to GSBaseStation::GetOwner (#13406)

* Add: [Script] GSBaseStation::GetOwner

Added method for Game Scripts to retrieve the owner of a basestation.

* Cleanup: [Script] Remove ScriptStation::GetOwner

Due to class inheritance, GSStation::GetOwner and GSWaypoint::GetOwner can both reach GetOwner defined at GSBaseStation.

src/script/api/script_station.hpp

@@ -59,15 +59,6 @@ public:
 	 */
 	static bool IsValidStation(StationID station_id);
 
-	/**
-	 * Get the owner of a station.
-	 * @param station_id The station to get the owner of.
-	 * @pre IsValidStation(station_id).
-	 * @return The owner the station has.
-	 * @api -ai
-	 */
-	static ScriptCompany::CompanyID GetOwner(StationID station_id);
-
 	/**
 	 * Get the StationID of a tile, if there is a station.
 	 * @param tile The tile to find the stationID of