Fix index not being used in Status.reblogs_map (mastodon#11982)

Regression from mastodon#11623

Author: Gargron

app/models/status.rb

@@ -308,7 +308,7 @@ def favourites_map(status_ids, account_id)
     end
 
     def reblogs_map(status_ids, account_id)
-      select('reblog_of_id').where(reblog_of_id: status_ids).where(account_id: account_id).reorder(nil).each_with_object({}) { |s, h| h[s.reblog_of_id] = true }
+      select('reblog_of_id').where(reblog_of_id: status_ids).where(account_id: account_id).unscoped.each_with_object({}) { |s, h| h[s.reblog_of_id] = true }
     end
 
     def mutes_map(conversation_ids, account_id)