test: Fix segfault in the psbt_wallet_tests/psbt_updater_test

The bug was introduced in dcd6eeb.

Author: hebasto

src/wallet/test/wallet_test_fixture.cpp

@@ -4,6 +4,8 @@
 
 #include <wallet/test/wallet_test_fixture.h>
 
+#include <scheduler.h>
+
 WalletTestingSetup::WalletTestingSetup(const std::string& chainName)
     : TestingSetup(chainName),
       m_wallet(m_node.chain.get(), "", CreateMockWalletDatabase())
@@ -12,3 +14,8 @@ WalletTestingSetup::WalletTestingSetup(const std::string& chainName)
     m_chain_notifications_handler = m_node.chain->handleNotifications({ &m_wallet, [](CWallet*) {} });
     m_wallet_client->registerRpcs();
 }
+
+WalletTestingSetup::~WalletTestingSetup()
+{
+    if (m_node.scheduler) m_node.scheduler->stop();
+}

src/wallet/test/wallet_test_fixture.h

@@ -19,6 +19,7 @@
  */
 struct WalletTestingSetup : public TestingSetup {
     explicit WalletTestingSetup(const std::string& chainName = CBaseChainParams::MAIN);
+    ~WalletTestingSetup();
 
     std::unique_ptr<interfaces::WalletClient> m_wallet_client = interfaces::MakeWalletClient(*m_node.chain, *Assert(m_node.args));
     CWallet m_wallet;