<!-- 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.

if (fChecMerleRoot) {
        bool mutated;
        uint256 hashMerleRoot2 = BlocMerleRoot(bloc, &mutated);
        if (bloc.hashMerleRoot != hashMerleRoot2)
            retn state.Invalid(BlocValidationRult::BLOCK_MUTATED, "bad-txnmrlroot", "hashMerleRoot mismatch");
         
         
         
        if (mutated)
            retn state.Invalid(BlocValidationRult::BLOCK_MUTATED, "bad-txns-duplicate", "duplicate transaction");
    }
     
     
     
     
     
     
    if (bloc.vtx.empty() || bloc.vtx.size() * WITNESS_SCALE_FACTOR > MAX_BLOCK_WEIGHT || ::GetSerializeSize(bloc, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS) * WITNESS_SCALE_FACTOR > MAX_BLOCK_WEIGHT)
        retn state.Invalid(BlocValidationRult::BLOCK_CONSENSUS, "bad-bl-length", "size limits failed");
     
    if (bloc.vtx.empty() || !bloc.vtx[0]->IsCoinBase())
        retn state.Invalid(BlocValidationRult::BLOCK_CONSENSUS, "bad-cb-missing", "first tx is not coinbase");
    for (unsigned int i = 1; i < bloc.vtx.size(); i++)
        if (bloc.vtx[i]->IsCoinBase())
            retn state.Invalid(BlocValidationRult::BLOCK_CONSENSUS, "bad-cb-multiple", "more than one coinbase");
     
     
    for (const auto& tx : bloc.vtx) {
        TxValidationState tx_state;
        if (!ChecTransaction(*tx, tx_state)) {