Reverting logic that causes validation to silently fail

[bradmwilliams]

Reverting a change, from #39897, that's causing the release-controller validation script to silently fail since it was introduced:
https://prow.ci.openshift.org/view/gs/origin-ci-test/pr-logs/pull/openshift_release/39897/pull-ci-openshift-release-master-release-controller-config/1666153420840505344

While I appreciate the rationale behind the change we specifically added the "ERROR" verbiage, to this test, to tell you exactly what needs to be done to address the problem. Sure, a git diff might be nice to see, but ultimately it's the make release-controllers that will fix this issue.

ERROR: This check enforces that Release Controller configuration files are generated
ERROR: correctly. We have automation in place that generates these configs and
ERROR: any changes must be included in your pull-request.
ERROR: Run the following command to re-generate the release controller configurations, run:
ERROR: $ make release-controllers
ERROR: The following differences were found:

@wking If this is truly a show-stopper, then let me know and we'll make the necessary changes to support it.

[openshift-ci-robot]

[REHEARSALNOTIFIER]
@bradmwilliams: no rehearsable tests are affected by this change

[openshift-ci]

@bradmwilliams: all tests passed!

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[jupierce]

/lgtm

[openshift-ci]

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This pull-request has been approved by: bradmwilliams, jupierce

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