<!-- 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 (!chainman.LoadBlockIndex()) {
        if (shutdown_requested && shutdown_requested()) return ChainstateLoadingError::SHUTDOWN_PROBED;
        return ChainstateLoadingError::ERROR_LOADING_BLOCK_DB;
    }
    if (!chainman.BlockIndex().empty() &&
            !chainman.m_blockman.LookupBlockIndex(consensus_params.hashGenesisBlock)) {
        return ChainstateLoadingError::ERROR_BAD_GENESIS_BLOCK;
    }
    
    
    if (chainman.m_blockman.m_have_pruned && !fPruneMode) {
        return ChainstateLoadingError::ERROR_PRUNED_NEEDS_REINDEX;
    }
    
    
    
    
    if (!fReindex && !chainman.ActiveChainstate().LoadGenesisBlock()) {
        return ChainstateLoadingError::ERROR_LOAD_GENESIS_BLOCK_FAILED;
    }
    
    
    for (CChainState* chainstate : chainman.GetAll()) {
        chainstate->InitCoinsDB(
            nCoinDBCache,
            coins_db_in_memory,
            fReset || fReindexChainState);
        if (coins_error_cb) {
            chainstate->CoinsErrorCatcher().AddReadErrCallback(coins_error_cb);
        }