fix wallet:which --displayName output (#5272)

Previously, the RPC wasn't receiving this parameter properly due to it being
left out of the yup schema. Add it to the schema so that the flag is properly
passed through.

ironfish/src/rpc/routes/wallet/getAccounts.ts

@@ -14,6 +14,7 @@ export type GetAccountsResponse = { accounts: string[] }
 export const GetAccountsRequestSchema: yup.ObjectSchema<GetAccountsRequest> = yup
   .object({
     default: yup.boolean().optional(),
+    displayName: yup.boolean().optional(),
   })
   .notRequired()
   .default({})