fix(pdf-worker): import worker setup from exported asyncReader path

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

src/helpers/pdfWorker.ts

@@ -2,7 +2,7 @@
  * SPDX-FileCopyrightText: 2026 LibreCode coop and contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
-import { setWorkerPath } from '@libresign/pdf-elements'
+import { setWorkerPath } from '@libresign/pdf-elements/src/utils/asyncReader'
 
 let configured = false