tx_pool: fix tx removal at startup keeping references

src/cryptonote_core/tx_pool.cpp

@@ -1284,6 +1284,7 @@ namespace cryptonote
         {
           MWARNING("Failed to parse tx from txpool, removing");
           remove.push_back(txid);
+          return true;
         }
         if (!insert_key_images(tx, meta.kept_by_block))
         {