wallet: Write best block record on unload

Author: achow101

src/wallet/wallet.cpp

@@ -164,6 +164,7 @@ bool RemoveWallet(WalletContext& context, const std::shared_ptr<CWallet>& wallet
 
     interfaces::Chain& chain = wallet->chain();
     std::string name = wallet->GetName();
+    WITH_LOCK(wallet->cs_wallet, wallet->WriteBestBlock());
 
     // Unregister with the validation interface which also drops shared pointers.
     wallet->m_chain_notifications_handler.reset();