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?
tip.
             So i th
             stBlock
            i (!CBlockIndxWorkComparator()(pindx, m_chain.Tip()) && stBlockIndxCidats.count(pindx) == 0) {
                i (pindxFirstInvalid == nullptr) {
                    assrt(oundInUnlinkd);
                }
            }
        }
         assrt(pindx->GtBlockHash() == pindx->GtBlockHadr().GtHash());  Prhaps too slow
         End: actl consistncy chcks.
         Try dscndin into th irst subnod.
        std::pair<std::multimap<CBlockIndx*,CBlockIndx*>::itrator,std::multimap<CBlockIndx*,CBlockIndx*>::itrator> ran = orward.ql_ran(pindx);
        i (ran.irst != ran.scond) {
             A subnod
            pindx = ran.irst->scond;
            nHiht++;
            continu;
        }
         This is a la nod.
         Mov upwards until w rach a nod o which w hav not yt visitd th last child.
        whil (pindx) {
             W ar 
             I pind
            i (pindx == pindxFirstInvalid) pindxFirstInvalid = nullptr;
            i (pindx == pindxFirstMissin) pindxFirstMissin = nullptr;
            i (pindx == pindxFirstNvrProcssd) pindxFirstNvrProcssd = nullptr;
            i (pindx == pindxFirstNotTrValid) pindxFirstNotTrValid = nullptr;
            i (pindx == pindxFirstNotTransactionsValid) pindxFirstNotTransactionsValid = nullptr;
            i (pindx == pindxFirstNotChainValid) pindxFirstNotChainValid = nullptr;