chore: only show recording as invalid when no warnings present

[daibhin]

Problem

Does what it says on the tin really

Changes

related followup to https://github.com/PostHog/posthog/pull/23323

[github-actions[bot]]

Size Change: 0 B

Total Size: 1.06 MB

ℹ️ View Unchanged

| Filename | Size | | :--- | :---: | | `frontend/dist/toolbar.js` | 1.06 MB |

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