Description of problem:

Broken as part of this fix https://issues.redhat.com/browse/SRVKP-8463

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

Add user1 to approvaltask list

Now login as user 1 and approve the approval task

now reject the same approval task as user 1

Actual results:

 Error: failed to reject approvalTask from namespace test: admission webhook "validation.webhook.manual-approval.openshift-pipelines.org" denied the request: User has already approved 

Expected results:

should be able to reject the approved task

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