Fixed addon-manager failing with non-default --apiserver-port

[moduspwnens]

This addresses issue #4384.

[minikube-bot]

Can one of the admins verify this patch?

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: moduspwnens
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[tstromberg]

@minikube-bot OK to test

[tstromberg]

Thank you for the bug fix!