test: standardize l10n mock usage in SigningMode.spec.ts

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

Author: vitormattos

src/tests/views/Settings/SigningMode.spec.ts

@@ -4,7 +4,6 @@
  */
 
 import { beforeEach, describe, expect, it, vi } from 'vitest'
-import { createL10nMock } from '../../testHelpers/l10n.js'
 import { mount } from '@vue/test-utils'
 import axios from '@nextcloud/axios'
 
@@ -16,7 +15,7 @@ vi.mock('@nextcloud/initial-state', () => ({
 	loadState: (...args: unknown[]) => loadStateMock(...args),
 }))
 
-vi.mock('@nextcloud/l10n', () => createL10nMock())
+vi.mock('@nextcloud/l10n', () => globalThis.mockNextcloudL10n())
 
 vi.mock('@nextcloud/axios', () => ({
 	default: {