Delete profile folder instead of just config.json

[fenglixa]

There will left a blank profile folder there after execute minikube delete. Fix it.

Fix #4570

[k8s-ci-robot]

Hi @fenglixa. Thanks for your PR.

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[minikube-bot]

Can one of the admins verify this patch?

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: fenglixa
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[fenglixa]

@RA489 could you please help review? Thanks very much

[RA489]

@fenglixa Thanks! for the PR

[RA489]

@minikube-bot OK to test

[fenglixa]

Thanks @RA489
I append my UT result here as well:

[fenglixa]

@minikube-bot OK to test

[medyagh]

This is really good ! thank you so much for fixing it ! @fenglixa

[medyagh]

Thank you so much for this contribution ! I really like it !

[fenglixa]

Thanks @medyagh