fix: repeated display of theme tabs. (#3727)

#### What type of PR is this?

/kind bug
/area console

#### What this PR does / why we need it:
获取主题配置时，重复添加了上次已经获取到的主题配置，导致重复显示。并同步修改了 plugin 中可能出现问题的位置。

#### Which issue(s) this PR fixes:

Fixes #3726 

#### Special notes for your reviewer:
1. 打开 Console 端主题页面
2. 点击右上角预览页面
3. 关闭预览页面，选项卡无重复即为正常。


#### Does this PR introduce a user-facing change?
```release-note
修复 Console 端主题设置中，选项卡会重复显示的问题
```

console/src/modules/interface/themes/layouts/ThemeLayout.vue

@@ -90,7 +90,7 @@ const { data: setting } = useQuery<Setting>({
     if (data) {
       const { forms } = data.spec;
       tabs.value = [
-        ...tabs.value,
+        ...initialTabs,
         ...forms.map((item: SettingForm) => {
           return {
             id: item.group,

console/src/modules/system/plugins/layouts/PluginLayout.vue

@@ -88,7 +88,7 @@ const { data: setting } = useQuery({
     if (data) {
       const { forms } = data.spec;
       tabs.value = [
-        ...tabs.value,
+        ...initialTabs,
         ...forms.map((item: SettingForm) => {
           return {
             id: item.group,