fix: total comment count for page and singlepage (#2498)

#### What type of PR is this?
/kind improvement
/area core
/milestone 2.0

#### What this PR does / why we need it:
修复文章和自定义页面的总评论数量统计取值错误
#### Which issue(s) this PR fixes:

Fixes #

#### Special notes for your reviewer:
/cc @halo-dev/sig-halo 
#### Does this PR introduce a user-facing change?

```release-note
None
```

src/main/java/run/halo/app/content/impl/PostServiceImpl.java

@@ -85,7 +85,7 @@ Stats fetchStats(Post post) {
         return Stats.builder()
             .visit(counter.getVisit())
             .upvote(counter.getUpvote())
-            .totalComment(counter.getApprovedComment())
+            .totalComment(counter.getTotalComment())
             .approvedComment(counter.getApprovedComment())
             .build();
     }

src/main/java/run/halo/app/content/impl/SinglePageServiceImpl.java

@@ -218,7 +218,7 @@ Stats fetchStats(SinglePage singlePage) {
         return Stats.builder()
             .visit(counter.getVisit())
             .upvote(counter.getUpvote())
-            .totalComment(counter.getApprovedComment())
+            .totalComment(counter.getTotalComment())
             .approvedComment(counter.getApprovedComment())
             .build();
     }