microRTPS: client: fix send per allocated topic

msg/templates/uorb_microcdr/microRTPS_client.cpp.em

@@ -119,6 +119,7 @@ void *send(void * /*unused*/)
 
 	while (!_should_exit_task) {
 @[    for idx, topic in enumerate(send_topics)]@
+		{
 			@(send_base_types[idx])_s @(topic)_data;
 
 			if (subs->@(topic)_sub.update(&@(topic)_data))
@@ -148,6 +149,7 @@ void *send(void * /*unused*/)
 
 @[        end if]@
 			}
+		}
 @[    end for]@
 		px4_usleep(_options.sleep_ms * 1000);
 		++loop;