<!-- 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.

{
        public:
            uint256 hash;
            bool found;
            BlockValidationState state;
            explicit submitblock_StateCatcher(const uint256& hashIn) : hash(hashIn), found(false), state() {}
        protected:
            void BlockChecked(const CBlock& block, const BlockValidationState& stateIn) override
            {
                if (block.GetHash() != hash)
                    return;
                found = true;
                state = stateIn;
            }
        };
        bool new_block;
        auto sc = std::make_shared<submitblock_StateCatcher>(block.GetHash());
        RegisterSharedValidationInterface(sc);
        bool accepted = chainman.ProcessNewBlock(chainparams, blockptr, true, &new_block);
        UnregisterSharedValidationInterface(sc);
        if (!new_block && accepted) {
            std::cerr << "duplicate" << std::endl;
            break;