perf[event]: 删除无用代码

event/src/main/java/com/zfoo/event/EventContext.java

@@ -69,9 +69,6 @@ public class EventContext implements ApplicationListener<ApplicationContextEvent
     @Override
     public void onApplicationEvent(ApplicationContextEvent event) {
         if (event instanceof ContextRefreshedEvent) {
-            if (instance != null) {
-                return;
-            }
             // 初始化上下文
             EventContext.instance = this;
             instance.applicationContext = event.getApplicationContext();