feat: update comment list sorter (#821)

#### What type of PR is this?

/kind feature

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

修改评论列表默认排序规则，以实现最新评论或最新回复的评论总显示在最前

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

Fixes https://github.com/halo-dev/halo/issues/3138

#### Screenshots:

![image](https://user-images.githubusercontent.com/17878156/212250458-edaeb149-8c3f-411d-b72b-5a70677cd300.png)

#### Special notes for your reviewer:

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

```release-note
修改评论列表默认排序规则，排序方式新增“最后回复时间”排序方式
```

src/modules/contents/comments/CommentList.vue

@@ -221,6 +221,10 @@ const SortFilterItems: {
 }[] = [
   {
     label: "默认",
+    value: undefined,
+  },
+  {
+    label: "最后回复时间",
     value: "LAST_REPLY_TIME",
   },
   {
@@ -283,7 +287,7 @@ function handleClearKeyword() {
 const hasFilters = computed(() => {
   return (
     selectedApprovedFilterItem.value.value !== undefined ||
-    selectedSortFilterItem.value.value !== "LAST_REPLY_TIME" ||
+    selectedSortFilterItem.value.value !== undefined ||
     selectedUser.value ||
     keyword.value
   );
@@ -358,7 +362,7 @@ function handleClearFilters() {
                 </FilterTag>
 
                 <FilterTag
-                  v-if="selectedSortFilterItem.value != 'LAST_REPLY_TIME'"
+                  v-if="selectedSortFilterItem.value != undefined"
                   @close="handleSortFilterItemChange(SortFilterItems[0])"
                 >
                   排序：{{ selectedSortFilterItem.label }}