[ML] Single Metric Viewer: Fix full refresh check.

[walterra]

Summary

Part of #52986

Fixes the check whether to do a full refresh of the page or not. lastRefresh was mistakenly part of the check. This fixes keeping the flyout open for rules editing.

Checklist

Use strikethroughs to remove checklist items you don't feel are applicable to this PR.

• This was checked for cross-browser compatibility, including a check against IE11
• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios
• This was checked for keyboard-only and screenreader accessibility

For maintainers

• This was checked for breaking API changes and was labeled appropriately
• This includes a feature addition or change that requires a release note and was labeled appropriately

[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[jgowdyelastic]

Code LGTM

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: a53ecfa

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@elasticmachine merge upstream

[peteharverson]

Tested and LGTM