fix: updating logic to show the view recording button in the feature flag page

[surbhi-posthog]

Problem

We only want to show the view recording button for the readOnly state of the page so I'm updating the logic to show the button.

This was the original PR that shows the button in the edit page as well: #26407

Changes

Before	After

Does this work well for both Cloud and self-hosted?

Cloud: Yes
Self-hosted: TBD

How did you test this code?

Locally: http://localhost:8000/project/2/feature_flags/12

[zlwaterfield]

Looks great!

[github-actions]

Size Change: 0 B

Total Size: 1.16 MB

ℹ️ View Unchanged

Filename	Size
frontend/dist/toolbar.js	1.16 MB

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