WC-5834 [wrangler] previews: fix e2e tests

[podonnell-dev]

Fixes WC-5834.

Fixing E2E test. Error revealed in #15657

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• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because: non-functional
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: testing fix revealed in CI

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commit: 4cc31e8