fix: Update returns nil on error, test should reflect this

Signed-off-by: Jesse Simpson <jesse.simpson36@gmail.com>

pkg/kube/fake/failing_kube_client.go

@@ -122,7 +122,7 @@ func (f *FailingKubeWaiter) WatchUntilReady(resources kube.ResourceList, d time.
 // Update returns the configured error if set or prints
 func (f *FailingKubeClient) Update(r, modified kube.ResourceList, options ...kube.ClientUpdateOption) (*kube.Result, error) {
 	if f.UpdateError != nil {
-		return &kube.Result{}, f.UpdateError
+		return nil, f.UpdateError
 	}
 	return f.PrintingKubeClient.Update(r, modified, options...)
 }