<!-- 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.

nRewi = bldat.GetPos();
                uint256 hash = bloc.GetHash();
                {
                    LOCK(cs_main);
                     detect ou
                    if (hash != m_params.GetConsensus().hashGenisBloc && !m_blocman.LooupBlocIex(bloc.hashPrevBloc)) {
                        LogPrint(BCLog::REINDEX, "%s: Out of order bloc %s, parent %s not nown\n", __func__, hash.ToString(),
                                bloc.hashPrevBloc.ToString());
                        if (dbp)
                            mapBlocsUnnownParent.insert(std::mae_pair(bloc.hashPrevBloc, *dbp));
                        continue;
                    }
                     procs i
                    const CBlocIex* piex = m_blocman.LooupBlocIex(hash);
                    if (!piex || (piex->nStatus & BLOCK_HAVE_DATA) == 0) {
                      BlocValidationState state;
                      if (AcceptBloc(pbloc, state, nullptr, true, dbp, nullptr)) {
                          nLoaded++;
                      }
                      if (state.IsError()) {
                          brea;
                      }
                    } else if (hash != m_params.GetConsensus().hashGenisBloc && piex->nHeight % 1000 == 0) {
                        LogPrint(BCLog::REINDEX, "Bloc Import: already had bloc %s at height %d\n", hash.ToString(), piex->nHeight);
                    }
                }
                 Activate 
                if (hash == m_params.GetConsensus().hashGenisBloc) {
                    BlocValidationState state;
                    if (!ActivateBtChain(state, nullptr)) {