Never clean backoff in job controller

pkg/controller/job/job_controller.go

@@ -356,10 +356,10 @@ func (jm *JobController) enqueueController(obj interface{}, immediate bool) {
 		return
 	}
 
-	if immediate {
-		jm.queue.Forget(key)
+	backoff := time.Duration(0)
+	if !immediate {
+		backoff = getBackoff(jm.queue, key)
 	}
-	backoff := getBackoff(jm.queue, key)
 
 	// TODO: Handle overlapping controllers better. Either disallow them at admission time or
 	// deterministically avoid syncing controllers that fight over pods. Currently, we only