blockchain: remove some dead code

This is already done

src/cryptonote_core/blockchain.cpp

@@ -3220,14 +3220,6 @@ bool Blockchain::expand_transaction_2(transaction &tx, const crypto::hash &tx_pr
       }
     }
   }
-  else if (rv.type == rct::RCTTypeCLSAG)
-  {
-    CHECK_AND_ASSERT_MES(rv.p.CLSAGs.size() == tx.vin.size(), false, "Bad CLSAGs size");
-    for (size_t n = 0; n < tx.vin.size(); ++n)
-    {
-      rv.p.CLSAGs[n].I = rct::ki2rct(boost::get<txin_to_key>(tx.vin[n]).k_image);
-    }
-  }
   else
   {
     CHECK_AND_ASSERT_MES(false, false, "Unsupported rct tx type: " + boost::lexical_cast<std::string>(rv.type));