Fix: disabling a disabled addon should not error

[sshukun]

Fixes #6749
It seems that enabling an enabled addon again is a designed behavior and does not cause error according to #6440.
But disabling a disabled addon will just cause error.

[k8s-ci-robot]

Hi @sshukun. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: sshukun
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[minikube-bot]

Can one of the admins verify this patch?

[sshukun]

/assign @medyagh
PTAL, thanks

[medyagh]

@sshukun thank you for fixing it