Update e2e test support__popover-invalid

[taipeicoder]

Proposed Changes

This PR updates tests in support__popover-invalid so that invalid search query terms are expected to return default results instead of empty results. The endpoint payload change is tracked via D110664-code.

Testing Instructions

• Ensure that the updated tests no longer fail.

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
• For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-ajp-p2)?

[github-actions]

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[matticbot]

This PR does not affect the size of JS and CSS bundles shipped to the user's browser.

Generated by performance advisor bot at iscalypsofastyet.com.

[worldomonation]

Changes make sense to me. Thanks for updating the test step name too!

[worldomonation]

It looks like the failure still persists after this change - haven't look into the root cause (whether the expectation is wrong, or the POM needs more work).

Muted the spec for now.