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

(cherry picked from commit 5e14a20b3b)

src/widgets/graph_widget.h

@@ -67,11 +67,6 @@ enum StationCargoWidgets {
 	WID_SCG_MATRIX_SCROLLBAR, ///< Cargo list scrollbar.
 };
 
-/** Widget of the #CompanyLeagueWindow class. */
-enum CompanyLeagueWidgets {
-	WID_CL_BACKGROUND, ///< Background of the window.
-};
-
 /** Widget of the #PerformanceRatingDetailWindow class. */
 enum PerformanceRatingDetailsWidgets {
 	WID_PRD_SCORE_FIRST, ///< First entry in the score list.