Corrected a bug where a corporate with unlimited subscription could not generate multiple codes

src/pages/(admin)/BatchCodeGenerator.tsx

@@ -51,6 +51,7 @@ export default function BatchCodeGenerator({ user }: { user: User }) {
   useEffect(() => {
     if (user && (user.type === "corporate" || user.type === "teacher")) {
       setExpiryDate(user.subscriptionExpirationDate || null);
+      setIsExpiryDateEnabled(!!user.subscriptionExpirationDate);
     }
   }, [user]);