<!-- 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.

{
    m_blocks_unlinked.clear();
    m_block_index.clear();
    m_blockfile_info.clear();
    m_last_blockfile = 0;
    m_dirty_blockindex.clear();
    m_dirty_fileinfo.clear();
    m_have_pruned = false;
}
bool BlockManager::WriteBlockIndexDB()
{
    AssertLockHeld(::cs_main);
    std::vector<std::pair<int, const CBlockFileInfo*>> vFiles;
    vFiles.reserve(m_dirty_fileinfo.size());
    for (std::set<int>::iterator it = m_dirty_fileinfo.begin(); it != m_dirty_fileinfo.end();) {
        vFiles.push_back(std::make_pair(*it, &m_blockfile_info[*it]));
        m_dirty_fileinfo.erase(it++);
    }
    std::vector<const CBlockIndex*> vBlocks;
    vBlocks.reserve(m_dirty_blockindex.size());
    for (std::set<CBlockIndex*>::iterator it = m_dirty_blockindex.begin(); it != m_dirty_blockindex.end();) {
        vBlocks.push_back(*it);
        m_dirty_blockindex.erase(it++);
    }
    if (!m_block_tree_db->WriteBatchSync(vFiles, m_last_blockfile, vBlocks)) {
        return false;
    }
    return true;
}
bool BlockManager::LoadBlockIndexDB()