Simplify custom world result editing controls

src/components/NpcModals.tsx

@@ -150,7 +150,10 @@ function TradeQuantityStepper({
 
 export function NpcModals({ gameState, npcUi }: NpcModalsProps) {
   const [tradeDetail, setTradeDetail] = useState<TradeDetailState>(null);
-  const currencyName = getCurrencyName(gameState.worldType);
+  const currencyName = getCurrencyName(
+    gameState.worldType,
+    gameState.customWorldProfile,
+  );
   const tradeModal = npcUi.tradeModal;
   const tradeNpcState = tradeModal
     ? gameState.npcStates[getNpcEncounterKey(tradeModal.encounter)]