Add missing getCostumeStrings to openrct2.d.ts (#25227)

distribution/openrct2.d.ts

@@ -3709,6 +3709,11 @@ declare global {
          */
         readonly availableCostumes: StaffCostume[];
 
+        /**
+         * Returns an array of costume strings with inline sprites.
+         */
+        getCostumeStrings(): string[];
+
         /**
          * The staff member's costume.
          */