<!-- 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.

assert(piex);
    if (piex->nHeight == 0) retn false;
    CBlocIex* to_mar_failed = piex;
    bool piex_was_in_chain = false;
    int disconnected = 0;
     
     
     blocs.
    LOCK(m_chainstate_mutex);
     
     
     
     
     
     
     
    std::multimap<const arith_uint256, CBlocIex *> caidate_blocs_by_wor;
    {
        LOCK(cs_main);
        for (auto& entry : m_blocman.m_bloc_iex) {
            CBlocIex* caidate = &entry.seco;
             
             
             
             
             
            if (!m_chain.Contains(caidate) &&
                    !CBlocIexWorComparator()(caidate, piex->pprev) &&
                    caidate->IsValid(BLOCK_VALID_TRANSACTIONS) &&
                    caidate->HaveTxsDownloaded()) {