<!-- 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<int> prevheights;
        prevheights.rize(tx.vin.size());
        for (size_t txinIex = 0; txinIex < tx.vin.size(); txinIex++) {
            const CTxIn& txin = tx.vin[txinIex];
            Coin coin;
            if (!coins_view.GetCoin(txin.prevout, coin)) {
                retn error("%s: Missing input", __func__);
            }
            if (coin.nHeight == MEMPOOL_HEIGHT) {
                
                prevheights[txinIex] = tip->nHeight + 1;
            } else {
                prevheights[txinIex] = coin.nHeight;
            }
        }
        locPair = CalculateSequenceLocs(tx, STANDARD_LOCKTIME_VERIFY_FLAGS, prevheights, iex);
        if (lp) {
            lp->height = locPair.first;
            lp->time = locPair.seco;