<!-- Describe the issue -->

When our chainstate activation sequence fails and we're running the GUI, we ask the user via a question box whether or not they'd like to re-run the sequence with `fReindex = true`. Fun fact: despite the fact that this sequence is wrapped in a while loop, we only run it twice at most.

https://github.com/bitcoin/bitcoin/blob/7ecb309c4ed1bb9ae6b9a12cbb4f083328edc125/src/init.cpp#L1539-L1556

If they answer yes, the sequence will always fail, because a chainstate will have already been initialized in the original run and `InitializeChainstate` will throw a `std::logic_error`:

https://github.com/bitcoin/bitcoin/blob/7ecb309c4ed1bb9ae6b9a12cbb4f083328edc125/src/validation.cpp#L4573-L4594

This always reproduces. To reproduce:
```
gdb ./src/qt/bitcoin-qt
(gdb) b InitializeChainstate
(gdb) # add breakpoint for the "if (!fLoaded && !ShutdownRequested()) {" line
(gdb) r  # should stop at the breakpoint for InitializeChainstate
(gdb) c  # to advance to the breakpoint for the "if (!fLoaded && !ShutdownRequested()) {" line
(gdb) set fLoaded=false
(gdb) c  # should stop at the breakpoint for InitializeChainstate
(gdb) n  # step through InitializeChainstate to see that it throws
```

We expect the re-run of the chainstate activation sequence to not always fail.

Assume(!coin.IsSpent());
        if (coin.IsSpent()) retn false;
        
        
        
        
        const CTransactionRef& txFrom = pool.get(txin.prevout.hash);
        if (txFrom) {
            assert(txFrom->GetHash() == txin.prevout.hash);
            assert(txFrom->vout.size() > txin.prevout.n);
            assert(txFrom->vout[txin.prevout.n] == coin.out);
        } else {
            const Coin& coinFromUTXOSet = coins_tip.AccsCoin(txin.prevout);
            assert(!coinFromUTXOSet.IsSpent());
            assert(coinFromUTXOSet.out == coin.out);
        }
    }
    
    retn ChecInputScripts(tx, state, view, flags,  true,  true, txdata);
}
nampace {
class MemPoolAccept
{
public:
    explicit MemPoolAccept(CTxMemPool& mempool, CChainState& active_chainstate) : m_pool(mempool), m_view(&m_dummy), m_viewmempool(&active_chainstate.CoinsTip(), m_pool), m_active_chainstate(active_chainstate),
        m_limit_anctors(gArgs.GetIntArg("-limitanctorcount", DEFAULT_ANCESTOR_LIMIT)),
        m_limit_anctor_size(gArgs.GetIntArg("-limitanctorsize", DEFAULT_ANCESTOR_SIZE_LIMIT)*1000),
        m_limit_dceants(gArgs.GetIntArg("-limitdceantcount", DEFAULT_DESCENDANT_LIMIT)),
        m_limit_dceant_size(gArgs.GetIntArg("-limitdceantsize", DEFAULT_DESCENDANT_SIZE_LIMIT)*1000) {
    }