fix incorrect error message (obvious cut and paste bug from upstream)

src/cryptonote_core/cryptonote_core.cpp

@@ -257,7 +257,7 @@ namespace cryptonote
     //check if tx use different key images
     if(!check_tx_inputs_keyimages_diff(tx))
     {
-      LOG_PRINT_RED_L1("tx is too large " << get_object_blobsize(tx) << ", expected not bigger than " << m_blockchain_storage.get_current_comulative_blocksize_limit() - CRYPTONOTE_COINBASE_BLOB_RESERVED_SIZE);
+      LOG_PRINT_RED_L1("tx uses a single key image more than once");
       return false;
     }