fix(dashboard): fix currency input locale formatting (#12812)

* fix: refund forms and format currency util

* fix: claim form

* fix: return form

* fix: exchange form

packages/admin/dashboard/src/lib/format-currency.ts

@@ -1,5 +1,5 @@
 export const formatCurrency = (amount: number, currency: string) => {
-  return new Intl.NumberFormat("en-US", {
+  return new Intl.NumberFormat(undefined, {
     style: "currency",
     currency,
     signDisplay: "auto",