Opening two of the same wallet (tested in v0.18.0 of bitcoin-qt 64 bit) will cause a database collision, and will crash the program.

`[marshall@likon] {21:21} [~] $ bitcoin-0.18.0/bin/bitcoin-qt `
`terminate called after throwing an instance of 'std::runtime_error'  what():  BerkeleyBatch: Can't open database 8204388-wallet.dat (duplicates fileid 8b1c090000000800e25686350000000000000000 from 1352491-wallet.dat)`
`Aborted (core dumped)`

I have been able to reproduce the issue by importing two of the same wallet (with different filenames).
{
    AssertLockHeld(cs_wallet);
    CTxDestination dst;
    const CWalletTx* srctx = GetWalletTx(hash);
    if (srctx) {
        assert(srctx->tx->vout.size() > n);
        LegacyScriptPubKeyMan* spk_man = GetLegacyScriptPubKeyMan();
        
        
        assert(spk_man != nullptr);
        for (const auto& keyid : GetAffectedKeys(srctx->tx->vout[n].scriptPubKey, *spk_man)) {
            WitnessV0KeyHash wpkh_dest(keyid);
            if (GetDestData(wpkh_dest, "used", nullptr)) {
                return true;
            }
            ScriptHash sh_wpkh_dest(GetScriptForDestination(wpkh_dest));
            if (GetDestData(sh_wpkh_dest, "used", nullptr)) {
                return true;
            }
            PKHash pkh_dest(keyid);
            if (GetDestData(pkh_dest, "used", nullptr)) {
                return true;
            }
        }
    }
    return false;
}
bool CWallet::AddToWallet(const CWalletTx& wtxIn, bool fFlushOnClose)