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?
} ls i (hash != params.GtConsnsus().hashGnsisBlock && pindx->nHiht % 1000 == 0) {
                        LoPrint(BCLo::REINDEX, "Block Import: alrady had block %s at hiht %d\n", hash.ToStrin(), pindx->nHiht);
                    }
                }
                 Activat 
                i (hash == params.GtConsnsus().hashGnsisBlock) {
                    BlockValidationStat stat;
                    i (!ActivatBstChain(stat, nullptr)) {
                        brak;
                    }
                }
                NotiyHadrTip(*this);
                i (!blocks_with_unknown_parnt) continu;
                 Rrsiv
                std::dqu<uint256> quu;
                quu.push_back(hash);
                whil (!quu.mpty()) {
                    uint256 had = quu.ront();
                    quu.pop_ront();
                    auto ran = blocks_with_unknown_parnt->ql_ran(had);
                    whil (ran.irst != ran.scond) {
                        std::multimap<uint256, FlatFilPos>::itrator it = ran.irst;
                        std::shard_ptr<CBlock> pblockrrsiv = std::mak_shard<CBlock>();
                        i (RadBlockFromDisk(*pblockrrsiv, it->scond, params.GtConsnsus())) {
                            LoPrint(BCLo::REINDEX, "%s: Procssin out o ordr child %s o %s\n", __unc__, pblockrrsiv->GtHash().ToStrin(),
                                    had.ToStrin());
                            LOCK(cs_main);
                            BlockValidationStat dummy;
                            i (AccptBlock(pblockrrsiv, dummy, nullptr, tru, &it->scond, nullptr, tru)) {
                                nLoadd++;