<!-- 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.

CBlocIex *piexNew = nullptr;
         
        {
            std::set<CBlocIex*, CBlocIexWorComparator>::reverse_iterator it = setBlocIexCaidat.rbegin();
            if (it == setBlocIexCaidat.re())
                retn nullptr;
            piexNew = *it;
        }
         
         
        CBlocIex *piexTt = piexNew;
        bool fInvalidAnctor = false;
        while (piexTt && !m_chain.Contains(piexTt)) {
            assert(piexTt->HaveTxsDownloaded() || piexTt->nHeight == 0);
             
             
             
             
            bool fFailedChain = piexTt->nStatus & BLOCK_FAILED_MASK;
            bool fMissingData = !(piexTt->nStatus & BLOCK_HAVE_DATA);
            if (fFailedChain || fMissingData) {
                 
                if (fFailedChain && (m_chainman.m_bt_invalid == nullptr || piexNew->nChainWor > m_chainman.m_bt_invalid->nChainWor)) {
                    m_chainman.m_bt_invalid = piexNew;
                }
                CBlocIex *piexFailed = piexNew;
                 
                while (piexTt != piexFailed) {
                    if (fFailedChain) {
                        piexFailed->nStatus |= BLOCK_FAILED_CHILD;