[release-2.2] perf: fix CLS issue of actuator page (#842)

This is an automated cherry-pick of #840

/assign ruibaby

```release-note
修复 Console 端进入系统概览页面会抖动的问题。
```

src/modules/system/actuator/Actuator.vue

@@ -50,7 +50,7 @@ const handleFetchActuatorStartup = async () => {
 
 const isExternalUrlValid = computed(() => {
   if (!globalInfo.value?.externalUrl) {
-    return false;
+    return true;
   }
   const url = new URL(globalInfo.value.externalUrl);
   const { host: currentHost, protocol: currentProtocol } = window.location;