Update orderProcessingWorkflow.ts

As per @olitomlinson 

Signed-off-by: Alice Gibbons <[email protected]>

Author: alicejgibbons

workflows/javascript/sdk/order-processor/orderProcessingWorkflow.ts

@@ -87,7 +87,7 @@ export const orderProcessingWorkflow: TWorkflow = async function* (ctx: Workflow
     tasks.push(approvalEvent);
     const timeOutEvent = ctx.createTimer(30);
     tasks.push(timeOutEvent);
-    const winner = ctx.whenAny(tasks);
+    const winner = yield ctx.whenAny(tasks);
 
     if (winner == timeOutEvent) {
       const orderNotification: OrderNotification = {