Protect: Fix ScanHistoryDetails fixedOn property

[dkmyta]

Fixes

There is mismatching fixedAt property passed in the usage of the ScanHistoryDetails component in the PaidAccordion. Because of this, undefined is passed and we display todays date.

Proposed changes:

• Update the property to fixedOn
• Rename properties for better clarity

Other information:

• [ ] Have you written new tests for your changes, if applicable?
• [x] Have you checked the E2E test CI results, and verified that your changes do not break them?
• [ ] Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

• https://github.com/Automattic/jpop-issues/issues/9202

Does this pull request change what data or activity we track or use?

• No

Testing instructions:

• View a site w/ the latest Protect version, a scan upgrade, and historical fixed threats
• Verify that the Threat fixed date in the history details is today's date
• Install the Jetpack Beta Tester plugin and upgrade Protect to this branch
• Reload the History and ensure that the date rendered is correct, and corresponds with the results in Calyspo

[github-actions[bot]]

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