<!-- 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.

std::vector<CMutableTransaction> noTxns;
    CScript scriptPubKey = CScript() << ToByteVector(coinbaseKey.GetPubKey()) << OP_CHECKSIG;
    CBlock validation_block = this->CreateBlock(noTxns, scriptPubKey, background_cs);
    auto pblock = std::make_shared<const CBlock>(validation_block);
    BlockValidationState state;
    CBlockIndex* pindex = nullptr;
    const CChainParams& chainparams = Params();
    bool newblock = false;
    
    
    {
        LOCK(::cs_main);
        bool checked = CheckBlock(*pblock, state, chainparams.GetConsensus());
        BOOST_CHECK(checked);
        bool accepted = background_cs.AcceptBlock(
            pblock, state, &pindex, true, nullptr, &newblock);
        BOOST_CHECK(accepted);
    }
    
    bool block_added = background_cs.ActivateBestChain(state, pblock);
    
    BOOST_CHECK_EQUAL(background_cs.m_chain.Tip()->GetBlockHash(), validation_block.GetHash());
    
    
    BOOST_CHECK(block_added);
    BOOST_CHECK_EQUAL(curr_tip, ::g_best_block);
}
BOOST_AUTO_TEST_SUITE_END()