fix: approving a post does not bump user comment_count (#3790)

Signed-off-by: Sami Mazouz <sychocouldy@gmail.com>

extensions/approval/src/Listener/UpdateDiscussionAfterPostApproval.php

@@ -36,5 +36,10 @@ class UpdateDiscussionAfterPostApproval
             $user->refreshCommentCount();
             $user->save();
         }
+
+        if ($post->user) {
+            $post->user->refreshCommentCount();
+            $post->user->save();
+        }
     }
 }