Fix topic deletion issue in master-slave clusters

Author: FaisalMisbah23

broker/src/main/java/org/apache/rocketmq/broker/slave/SlaveSynchronize.java

@@ -93,9 +93,9 @@ private void syncTopicConfig() {
                     while (iterator.hasNext()) {
                         Map.Entry<String, TopicConfig> entry = iterator.next();
                         if (!newTopicConfigTable.containsKey(entry.getKey())) {
-                            iterator.remove();
+                            iterator.remove();                        
+                            topicConfigManager.deleteTopicConfig(entry.getKey());
                         }
-                        topicConfigManager.deleteTopicConfig(entry.getKey());
                     }
 
                     //update
@@ -188,9 +188,9 @@ private void syncSubscriptionGroupConfig() {
                     while (iterator.hasNext()) {
                         Map.Entry<String, SubscriptionGroupConfig> configEntry = iterator.next();
                         if (!newSubscriptionGroupTable.containsKey(configEntry.getKey())) {
-                            iterator.remove();
+                            iterator.remove();                        
+                            subscriptionGroupManager.deleteSubscriptionGroupConfig(configEntry.getKey());
                         }
-                        subscriptionGroupManager.deleteSubscriptionGroupConfig(configEntry.getKey());
                     }
                     // update
                     newSubscriptionGroupTable.values().forEach(subscriptionGroupManager::putSubscriptionGroupConfig);