message: test: Avoid excessive locking of `cs_wallet`
diff: BOOST_FIXTURE_TEST_SUITE(psbt_wallet_tests, WalletTestingSetup)
  static void import_descriptor(CWallet& wallet, const std::string& descriptor)
  + EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet)
  {
  - LOCK(wallet.cs_wallet);
  + AssertLockHeld(wallet.cs_wallet);
  FlatSigningProvider provider;
  std::string error;
  std::unique_ptr<Descriptor> desc = Parse(descriptor, provider, error, /* require_checksum=*/ false);
  