wallet2: set propagation timeout to current max timeout

src/wallet/wallet2.cpp

@@ -2961,7 +2961,8 @@ void wallet2::update_pool_state(std::vector<std::tuple<cryptonote::transaction,
   MTRACE("update_pool_state got pool");
 
   // remove any pending tx that's not in the pool
-  constexpr const std::chrono::seconds tx_propagation_timeout{CRYPTONOTE_DANDELIONPP_EMBARGO_AVERAGE * 3 / 2};
+  // TODO: set tx_propagation_timeout to CRYPTONOTE_DANDELIONPP_EMBARGO_AVERAGE * 3 / 2 after v15 hardfork
+  constexpr const std::chrono::seconds tx_propagation_timeout{500};
   const auto now = std::chrono::system_clock::now();
   std::unordered_map<crypto::hash, wallet2::unconfirmed_transfer_details>::iterator it = m_unconfirmed_txs.begin();
   while (it != m_unconfirmed_txs.end())