avoid redundant type conversion of DefaultEvictorArgs parameter in DefaultEvictor

[fanhaouu]

Now the DefaultEvictorArgs parameters undergo redundant type conversion in DefaultEvictor, which is unnecessary.

This pr can resolve that.

[k8s-ci-robot]

Hi @fanhaouu. Thanks for your PR.

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[a7i]

/cc @ingvagabund

[a7i]

/ok-to-test

[jklaw90]

/lgtm

[a7i]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: a7i

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[ingvagabund]

All good here :) Thx. It looks like a leftover from the migration to plugins.