remove unnecessary S in ProtocolType validation

[spacewander]

What type of PR is this?

/kind bug

What this PR does / why we need it:

remove unnecessary S in ProtocolType validation

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

Hi @spacewander. Thanks for your PR.

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[spacewander]

@youngnick
Would you take a look at this? Thanks!

[robscott]

Thanks for catching this one @spacewander!

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: robscott, spacewander

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[robscott]

/ok-to-test

[gauravkghildiyal]

Thanks!

/lgtm