web/admin: fix invalid build due to wrong import

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

web/src/pages/stages/authenticator_webauthn/AuthenticateWebAuthnStageForm.ts

@@ -5,7 +5,7 @@ import { t } from "@lingui/macro";
 import { TemplateResult, html } from "lit";
 import { customElement } from "lit/decorators.js";
 import { ifDefined } from "lit/directives/if-defined.js";
-import { until } from "lit/directives/until";
+import { until } from "lit/directives/until.js";
 
 import {
     AuthenticateWebAuthnStage,