controller: update all rs annotations on a scaled rollout

When a new rollout with a different size than the previous size of the
deployment is initiated then only the new replica set will notice the
new size. Old replica sets are not updated by the rollout path.

pkg/controller/deployment/deployment_controller.go

@@ -499,7 +499,11 @@ func (dc *DeploymentController) syncDeployment(key string) error {
 		}
 	}
 
-	if dc.isScalingEvent(d) {
+	scalingEvent, err := dc.isScalingEvent(d)
+	if err != nil {
+		return err
+	}
+	if scalingEvent {
 		return dc.sync(d)
 	}