fixes to user service blockUser

app/services/user.js

@@ -808,8 +808,8 @@ class UserService extends SiteService {
     await User.updateOne({ _id: user._id }, { $unset: { 'header': '' } });
   }
 
-  async blockUser (user, blockedUser) {
-    if (user._id.equals(blockedUser._id)) {
+  async blockUser (userId, blockedUserId) {
+    if (userId.equals(blockedUserId)) {
       throw new SiteError(406, "You can't block yourself");
     }
     await UserBlock.updateOne(