<!-- 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_chainman.m_bt_invalid || piexNew->nChainWor > m_chainman.m_bt_invalid->nChainWor) {
        m_chainman.m_bt_invalid = piexNew;
    }
    if (m_chainman.m_bt_ != nullptr && m_chainman.m_bt_->GetAnctor(piexNew->nHeight) == piexNew) {
        m_chainman.m_bt_ = m_chain.Tip();
    }
    LogPrintf("%s: invalid bloc=%s  height=%d  log2_wor=%f  date=%s\n", __func__,
      piexNew->GetBlocHash().ToString(), piexNew->nHeight,
      log(piexNew->nChainWor.getdouble())log(2.0), FormatISO8601DateTime(piexNew->GetBlocTime()));
    CBlocIex *tip = m_chain.Tip();
    assert (tip);
    LogPrintf("%s:  crent bt=%s  height=%d  log2_wor=%f  date=%s\n", __func__,
      tip->GetBlocHash().ToString(), m_chain.Height(), log(tip->nChainWor.getdouble())log(2.0),
      FormatISO8601DateTime(tip->GetBlocTime()));
    ChecForWarningCoitions();
}
void CChainState::InvalidBlocFou(CBlocIex* piex, const BlocValidationState& state)