Remove unnecessary build-args

[youngbo89]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Clearer Readability by removing unused build-args

[k8s-ci-robot]

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[adrianmoisey]

It seems these were removed from the Dockerfile in 9a754db

Not a developer, so my +1 is meaningless, but this looks good to me

[voelzmo]

Good catch! This is indeed a leftover from the refactoring done to the build process in #6338.
/lgtm

[youngbo89]

/assign

[kwiesmueller]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kwiesmueller, youngbo89

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