fix: resolve issue of duplicate post creation (#7313)

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#### What type of PR is this?

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/area ui
/kind bug

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

See #6994

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

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Fixes #6994

#### Special notes for your reviewer:

统一了发布文章时的行为，均先确保服务端创建草稿后保存内容。

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

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```release-note
修复文章重复生成的问题
```

ui/uc-src/modules/contents/posts/PostEditor.vue

@@ -168,8 +168,8 @@ const {
 );
 
 useAutoSaveContent(currentCache, toRef(content.value, "raw"), async () => {
-  // Do not save when the setting modal is open
-  if (postSettingEditModal.value) {
+  // Do not save when the setting modal or the creation modal is open
+  if (postSettingEditModal.value || postPublishModal.value) {
     return;
   }
   if (isUpdateMode.value) {