A call to `removeprunedfunds` does not update the transaction list in the GUI, and trying to access the info of a deleted transaction will result in a segfault.

```bash
(lldb) run
Process 4859 launched: '/Users/michael/github/bitcoin/src/qt/bitcoin-qt' (x86_64)
2019-09-24 15:41:53.763094+0800 bitcoin-qt[4859:390268] MessageTracer: Falling back to default whitelist
Process 4859 stopped
* thread #1, name = 'bitcoin-main', queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x34)
    frame #0: 0x00000001001c9bf6 bitcoin-qt`TransactionDesc::FormatTxStatus(wtx=0x00007ffeefbfc0e0, status=0x00007ffeefbfc0c0, inMempool=false, numBlocks=1) at transactiondesc.cpp:33:31
   30  	{
   31  	    if (!status.is_final)
   32  	    {
-> 33  	        if (wtx.tx->nLockTime < LOCKTIME_THRESHOLD)
   34  	            return tr("Open for %n more block(s)", "", wtx.tx->nLockTime - numBlocks);
   35  	        else
   36  	            return tr("Open until %1").arg(GUIUtil::dateTimeStr(wtx.tx->nLockTime));
Target 0: (bitcoin-qt) stopped.
```
{
    if (nIndex != -1) {
        pwallet->ReturnKey(nIndex, fInternal, vchPubKey);
    }
    nIndex = -1;
    vchPubKey = CPubKey();
    address = CNoDestination();
}
void CWallet::MarkReserveKeysAsUsed(int64_t keypool_id)
{
    AssertLockHeld(cs_wallet);
    bool internal = setInternalKeyPool.count(keypool_id);
    if (!internal) assert(setExternalKeyPool.count(keypool_id) || set_pre_split_keypool.count(keypool_id));
    std::set<int64_t> *setKeyPool = internal ? &setInternalKeyPool : (set_pre_split_keypool.empty() ? &setExternalKeyPool : &set_pre_split_keypool);
    auto it = setKeyPool->begin();
    WalletBatch batch(*database);
    while (it != std::end(*setKeyPool)) {
        const int64_t& index = *(it);
        if (index > keypool_id) break; 
        CKeyPool keypool;
        if (batch.ReadPool(index, keypool)) { 
            m_pool_key_to_index.erase(keypool.vchPubKey.GetID());
        }
        LearnAllRelatedScripts(keypool.vchPubKey);
        batch.ErasePool(index);
        WalletLogPrintf("keypool index %d removed\n", index);
        it = setKeyPool->erase(it);
    }
}
void CWallet::LockCoin(const COutPoint& output)