Feature: [GS] Scriptable league tables (#10001)

(cherry picked from commit 5e14a20b3b)

src/graph_gui.h

@@ -20,7 +20,6 @@ void ShowDeliveredCargoGraph();
 void ShowPerformanceHistoryGraph();
 void ShowCompanyValueGraph();
 void ShowCargoPaymentRates();
-void ShowCompanyLeagueTable();
 void ShowPerformanceRatingDetail();
 void ShowStationCargo(StationID);