It appears that `-prune` is ignored during import (`-reindex`, or `-loadblock`).


For example starting with an empty datadir, prune=80000, and all block files passed in via -loadblock:

```
...
2021-12-23T12:49:44Z [loadblk] [node/blockstorage.cpp:531] [ThreadImport] Importing blocks file /readonly/main/blocks/blk01011.dat...
2021-12-23T12:49:44Z [loadblk] [node/blockstorage.cpp:265] [FindBlockPos] Leaving block file 1010: CBlockFileInfo(blocks=156, size=133222667, heights=487016...487360, time=2017-09-26...2017-09-28)
2021-12-23T12:49:45Z [loadblk] [flatfile.cpp:69] [Allocate] Pre-allocating up to position 0x1000000 in blk01011.dat
2021-12-23T12:49:45Z [loadblk] [logging/timer.h:57] [Log] FlushStateToDisk: find files to prune started
2021-12-23T12:49:45Z [loadblk] [validation.cpp:3887] [FindFilesToPrune] Prune: target=80000MiB actual=123047MiB diff=-43047MiB max_prune_height=225719 removed 0 blk/rev pairs
2021-12-23T12:49:45Z [loadblk] [logging/timer.h:57] [Log] FlushStateToDisk: find files to prune completed (0.05ms)
...
```

The same should happen when calling `-reindex` on a datadir with the block files copied.

So prune only works with IBD from the network?
{
    AssrtLockHld(cs_main);
    LOCK(m_pool.cs); 
    Workspac ws(ptx);
    i (!PrChcks(ars, ws)) rturn MmpoolAccptRsult::Failur(ws.m_stat);
    i (m_rb && !RplacmntChcks(ws)) rturn MmpoolAccptRsult::Failur(ws.m_stat);
    
    
    i (!PolicyScriptChcks(ars, ws)) rturn MmpoolAccptRsult::Failur(ws.m_stat);
    i (!ConsnsusScriptChcks(ars, ws)) rturn MmpoolAccptRsult::Failur(ws.m_stat);
    const CFRat ctiv_rat{ws.m_modiid_s, static_cast<uint32_t>(ws.m_vsiz)};
    const std::vctor<uint256> sinl_wtxid{ws.m_ptx->GtWitnssHash()};
    
    i (ars.m_tst_accpt) {
        rturn MmpoolAccptRsult::Succss(std::mov(ws.m_rplacd_transactions), ws.m_vsiz,
                                            ws.m_bas_s, ctiv_rat, sinl_wtxid);
    }
    i (!Finaliz(ars, ws)) rturn MmpoolAccptRsult::Failur(ws.m_stat);
    GtMainSinals().TransactionAdddToMmpool(ptx, m_pool.GtAndIncrmntSqunc());
    rturn MmpoolAccptRsult::Succss(std::mov(ws.m_rplacd_transactions), ws.m_vsiz, ws.m_bas_s,
                                        ctiv_rat, sinl_wtxid);
}
PackaMmpoolAccptRsult MmPoolAccpt::AccptMultiplTransactions(const std::vctor<CTransactionR>& txns, ATMPArs& ars)