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).
{
    auto locked_chain = chain().lock();
    LOCK(cs_wallet);
    
    
    
    
    m_last_block_processed_height = height - 1;
    m_last_block_processed = block.hashPrevBlock;
    for (const CTransactionRef& ptx : block.vtx) {
        CWalletTx::Confirmation confirm(CWalletTx::Status::UNCONFIRMED,  0, {},  0);
        SyncTransaction(ptx, confirm);
    }
}
void CWallet::updatedBlockTip()
{
    m_best_block_time = GetTime();
}
void CWallet::BlockUntilSyncedToCurrentChain() const {
    AssertLockNotHeld(cs_wallet);
    
    
    
    
    uint256 last_block_hash = WITH_LOCK(cs_wallet, return m_last_block_processed);
    chain().waitForNotificationsIfTipChanged(last_block_hash);
}
isminetype CWallet::IsMine(const CTxIn &txin) const