Revert "Fix check for disconnecting peers when syncing"

This reverts commit adc16d2504.

src/cryptonote_protocol/cryptonote_protocol_handler.inl

@@ -342,7 +342,7 @@ namespace cryptonote
 
     if(m_core.have_block(hshd.top_id))
     {
-      if (target > m_core.get_current_blockchain_height())
+      if (target > hshd.current_height)
       {
         MINFO(context << "peer is not ahead of us and we're syncing, disconnecting");
         return false;