test: adjust windows WebSocket test expectation

[mxschmitt]

Fixes https://github.com/microsoft/playwright/actions/runs/14343762089/job/40209155233#step:3:518

Extracted from #35389 which was reverted.

[github-actions]

Test results for "tests 1"

2 failed
❌ [playwright-test] › runner.spec.ts:118:5 › should ignore subprocess creation error because of SIGINT @macos-latest-node18-1
❌ [default] › debug-tests.spec.ts:109:5 › should debug error @vscode-extension

3 flaky

⚠️ [firefox-page] › page/page-evaluate.spec.ts:424:3 › should throw for too deep reference chain @firefox-ubuntu-22.04-node18
⚠️ [webkit-library] › library/browsercontext-viewport-mobile.spec.ts:87:5 › mobile viewport › should support window.orientation emulation @webkit-ubuntu-22.04-node18
⚠️ [webkit-page] › page/page-screenshot.spec.ts:345:5 › page screenshot › should work while navigating @webkit-ubuntu-22.04-node18

39093 passed, 807 skipped
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Merge workflow run.