Fix init

Author: AnonHxy

pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentTopic.java

@@ -3044,7 +3044,7 @@ private CompletableFuture<Void> updateSubscriptionsDispatcherRateLimiter() {
             subscriptionCheckFutures.add(FutureUtil.waitForAll(consumerCheckFutures).thenRun(() -> {
                 Dispatcher dispatcher = sub.getDispatcher();
                 if (dispatcher != null) {
-                    dispatcher.getRateLimiter().ifPresent(DispatchRateLimiter::updateDispatchRate);
+                    dispatcher.updateRateLimiter();
                 }
             }));
         });