Fix bug where cert files cannot have parenthesis in its name

[Chasarr]

I have never once programmed in Go before, but I think this fix should work? I'm unable to try it out myself, but I'll give it a shot sometime next week on my other machine with custom certs installed.

fixes #20080

[linux-foundation-easycla]

• ✅login: Chasarr / (3c0294a)

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[k8s-ci-robot]

Hi @Chasarr. Thanks for your PR.

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[minikube-bot]

Can one of the admins verify this patch?

[medyagh]

@Chasarr welcome to being a minikube contributor and thank you for this PR, do you mind putting before/after this PR in your PR description ? so we can see what the minikube output looked like Before and After your PR