fix: Minor HTTP typing fixes (#7380)

packages/core/types/src/http/common/request.ts

@@ -1,5 +1,5 @@
 export interface SelectParams {
-  fields?: string[]
+  fields?: string
 }
 
 export interface FindParams extends SelectParams {

packages/medusa/src/api/store/orders/query-config.ts

@@ -16,6 +16,7 @@ export const defaultStoreRetrieveOrderFields = [
   "version",
   "summary",
   "currency_code",
+  "display_id",
   "total",
   "subtotal",
   "tax_total",