fix: show plugin error message (#5838)

#### What type of PR is this?

/area ui
/kind bug
/milestone 2.15.0

#### What this PR does / why we need it:

修复插件异常启动时，指示器显示不正确的问题。

Fixes https://github.com/halo-dev/halo/pull/5520

#### Does this PR introduce a user-facing change?

```release-note
None
```

ui/console-src/modules/system/plugins/composables/use-plugin.ts

@@ -33,16 +33,8 @@ export function usePluginLifeCycle(
     const { enabled } = plugin.value.spec || {};
     const { phase } = plugin.value.status || {};
 
-    // Starting up
-    if (
-      enabled &&
-      phase !== (PluginStatusPhaseEnum.Started || PluginStatusPhaseEnum.Failed)
-    ) {
-      return t("core.common.status.starting_up");
-    }
-
     // Starting failed
-    if (!isStarted.value) {
+    if (enabled && phase === PluginStatusPhaseEnum.Failed) {
       const lastCondition = plugin.value.status?.conditions?.[0];
 
       return (
@@ -51,6 +43,14 @@ export function usePluginLifeCycle(
           .join(":") || "Unknown"
       );
     }
+
+    // Starting up
+    if (
+      enabled &&
+      phase !== (PluginStatusPhaseEnum.Started || PluginStatusPhaseEnum.Failed)
+    ) {
+      return t("core.common.status.starting_up");
+    }
   };
 
   const { isLoading: changingStatus, mutate: changeStatus } = useMutation({