bench: Remove incorrect LoadWallet call in WalletBalance

The WalletBalance benchmarks would incorrectly call LoadWallet after the
wallet has been setup. LoadWallet expects to be the first thing that is
called and for the CWallet to be in a fresh state. When it is not, it
results in bogus pointers which can cause segfaults during this
benchmark.

Author: achow101

src/bench/wallet_balance.cpp

@@ -26,7 +26,6 @@ static void WalletBalance(benchmark::Bench& bench, const bool set_dirty, const b
         LOCK(wallet.cs_wallet);
         wallet.SetWalletFlag(WALLET_FLAG_DESCRIPTORS);
         wallet.SetupDescriptorScriptPubKeyMans();
-        if (wallet.LoadWallet() != DBErrors::LOAD_OK) assert(false);
     }
     auto handler = test_setup->m_node.chain->handleNotifications({&wallet, [](CWallet*) {}});