Fix Qt test broken by #22219

It looks like this should have been caught by CI but perhaps there was a
conflict with a recently merged PR. Failure reported by fanquake <fanquake@gmail.com>
https://github.com/bitcoin/bitcoin/pull/22219#issuecomment-920496509

src/qt/test/addressbooktests.cpp

@@ -60,6 +60,8 @@ void EditAddressAndSubmit(
 void TestAddAddressesToSendBook(interfaces::Node& node)
 {
     TestChain100Setup test;
+    auto wallet_client = interfaces::MakeWalletClient(*test.m_node.chain, *Assert(test.m_node.args));
+    test.m_node.wallet_client = wallet_client.get();
     node.setContext(&test.m_node);
     std::shared_ptr<CWallet> wallet = std::make_shared<CWallet>(node.context()->chain.get(), "", CreateMockWalletDatabase());
     wallet->SetupLegacyScriptPubKeyMan();