add manage track design window (UNTESTED)

src/interface/window.h

@@ -391,10 +391,9 @@ enum {
 	WC_EDITOR_INVENTION_LIST_DRAG = 44,
 	WC_EDITOR_SCENARIO_OPTIONS = 45,
 	WC_EDTIOR_OBJECTIVE_OPTIONS = 46,
-	WC_47,
-	WC_48,
+	WC_MANAGE_TRACK_DESIGN = 47,
+	WC_TRACK_DELETE_PROMPT = 48,
 	WC_CLEAR_SCENERY = 50,
-	WC_MANAGE_TRACK_DESIGN = 89,
 	WC_CHEATS = 110,
 	WC_RESEARCH = 111,
 	WC_VIEWPORT = 112,