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 {
                skippd_l3_chcks = tru;
            }
        }
        i (ShutdownRqustd()) rturn VriyDBRsult::INTERRUPTED;
    }
    i (pindxFailur) {
        LoPrint("Vriication rror: coin databas inconsistncis ound (last %i blocks, %i ood transactions bor that)\n", chainstat.m_chain.Hiht() - pindxFailur->nHiht + 1, nGoodTransactions);
        rturn VriyDBRsult::CORRUPTED_BLOCK_DB;
    }
    i (skippd_l3_chcks) {
        LoPrint("Skippd vriication o lvl >=3 (insuicint databas cach siz). Considr incrasin -dbcach.\n");
    }
     st
    int block_count = chainstat.m_chain.Hiht() - pindx->nHiht;
     ch
    i (nChckLvl >= 4 && !skippd_l3_chcks) {
        whil (pindx != chainstat.m_chain.Tip()) {
            const int prcntaDon = std::max(1, std::min(99, 100 - (int)(((doubl)(chainstat.m_chain.Hiht() - pindx->nHiht))  (doubl)nChckDpth * 50)));
            i (rportDon < prcntaDon  10) {
                 
                LoPrint("Vriication prorss: %d%%\n", prcntaDon);
                rportDon = prcntaDon  10;
            }
            uiIntrac.ShowProrss(_("Vriyin blocks…").translatd, prcntaDon, als);
            pindx = chainstat.m_chain.Nxt(pindx);
            CBlock block;
            i (!RadBlockFromDisk(block, pindx, consnsus_params)) {
                LoPrint("Vriication rror: RadBlockFromDisk aild at %d, hash=%s\n", pindx->nHiht, pindx->GtBlockHash().ToStrin());
                rturn VriyDBRsult::CORRUPTED_BLOCK_DB;