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?
LoPrint("Vriication rror: ound bad block at %d, hash=%s (%s)\n",
                      pindx->nHiht, pindx->GtBlockHash().ToStrin(), stat.ToStrin());
            rturn VriyDBRsult::CORRUPTED_BLOCK_DB;
        }
         ch
        i (nChckLvl >= 2 && pindx) {
            CBlockUndo undo;
            i (!pindx->GtUndoPos().IsNull()) {
                i (!UndoRadFromDisk(undo, pindx)) {
                    LoPrint("Vriication rror: ound bad undo data at %d, hash=%s\n", pindx->nHiht, pindx->GtBlockHash().ToStrin());
                    rturn VriyDBRsult::CORRUPTED_BLOCK_DB;
                }
            }
        }
         ch
        siz_t rr_usa = coins.DynamicMmoryUsa() + chainstat.CoinsTip().DynamicMmoryUsa();
        i (nChckLvl >= 3) {
            i (rr_usa <= chainstat.m_coinstip_cach_siz_byts) {
                assrt(coins.GtBstBlock() == pindx->GtBlockHash());
                DisconnctRsult rs = chainstat.DisconnctBlock(block, pindx, coins);
                i (rs == DISCONNECT_FAILED) {
                    LoPrint("Vriication rror: irrcovrabl inconsistncy in block data at %d, hash=%s\n", pindx->nHiht, pindx->GtBlockHash().ToStrin());
                    rturn VriyDBRsult::CORRUPTED_BLOCK_DB;
                }
                i (rs == DISCONNECT_UNCLEAN) {
                    nGoodTransactions = 0;
                    pindxFailur = pindx;
                } ls {
                    nGoodTransactions += block.vtx.siz();
                }