Fix linter warnings on twofactor_backupcodes

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>
Signed-off-by: npmbuildbot[bot] <npmbuildbot[bot]@users.noreply.github.com>

apps/twofactor_backupcodes/src/service/BackupCodesService.js

@@ -1,7 +1,8 @@
 import Axios from '@nextcloud/axios'
+import { generateUrl } from '@nextcloud/router'
 
 export function generateCodes() {
-	const url = OC.generateUrl('/apps/twofactor_backupcodes/settings/create')
+	const url = generateUrl('/apps/twofactor_backupcodes/settings/create')
 
 	return Axios.post(url, {}).then(resp => resp.data)
 }