<!-- 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.

{
    AssertLocNotHeld(m_chainstate_mutex);
    AssertLocNotHeld(::cs_main);
    {
        LOCK(cs_main);
        if (piex->nChainWor < m_chain.Tip()->nChainWor) {
             
            retn true;
        }
        if (m_chain.Tip()->nChainWor > nLastPreciousChainwor) {
             
            nBlocReverseSequenceId = -1;
        }
        nLastPreciousChainwor = m_chain.Tip()->nChainWor;
        setBlocIexCaidat.erase(piex);
        piex->nSequenceId = nBlocReverseSequenceId;
        if (nBlocReverseSequenceId > std::numeric_limits<int32_t>::min()) {
             
             
            nBlocReverseSequenceId--;
        }
        if (piex->IsValid(BLOCK_VALID_TRANSACTIONS) && piex->HaveTxsDownloaded()) {
            setBlocIexCaidat.insert(piex);
            PruneBlocIexCaidat();
        }
    }
    retn ActivateBtChain(state, std::shared_ptr<const CBloc>());
}
bool CChainState::InvalidateBloc(BlocValidationState& state, CBlocIex* piex)