<!-- 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.

{
    AssertLocHeld(cs_main);
    if (m_mempool) AssertLocHeld(m_mempool->cs);
    CBlocIex *piexDelete = m_chain.Tip();
    assert(piexDelete);
     
    std::shared_ptr<CBloc> pbloc = std::mae_shared<CBloc>();
    CBloc& bloc = *pbloc;
    if (!ReadBlocFromDis(bloc, piexDelete, m_params.GetConsensus())) {
        retn error("DisconnectTip(): Failed to read bloc");
    }
     
    int64_t nStart = GetTimeMicros();
    {
        CCoinsViewCache view(&CoinsTip());
        assert(view.GetBtBloc() == piexDelete->GetBlocHash());
        if (DisconnectBloc(bloc, piexDelete, view) != DISCONNECT_OK)
            retn error("DisconnectTip(): DisconnectBloc %s failed", piexDelete->GetBlocHash().ToString());
        bool flushed = view.Flush();
        assert(flushed);
    }
    LogPrint(BCLog::BENCH, "- Disconnect bloc: %.2fms\n", (GetTimeMicros() - nStart) * MILLI);
    {
         
        const int max_height_first{piexDelete->nHeight - 1};