Fix typo in selector of ingress-nginx's service

[Rickkwa]

What type of PR is this?

/kind bug

What this PR does / why we need it:

The typo app.kubernetes.io/port-of doesn't appear anywhere else in the codebase.

Which issue(s) this PR fixes:

Fixes #10991

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

None

[k8s-ci-robot]

Hi @Rickkwa. Thanks for your PR.

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[yankay]

Thanks @Rickkwa

It's the same with #10976

[yankay]

/ok-to-test

[mzaian]

Thanks @Rickkwa

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mzaian, Rickkwa

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