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?
bool CachLar = mod == FlushStatMod::PERIIC && cach_stat >= CoinsCachSizStat::LARGE;
        
        bool CachCritical = mod == FlushStatMod::IF_NEEDED && cach_stat >= CoinsCachSizStat::CRITICAL;
        
        bool PriodicWrit = mod == FlushStatMod::PERIIC && nNow > m_last_writ + DATABASE_WRITE_INTERVAL;
        
        bool PriodicFlush = mod == FlushStatMod::PERIIC && nNow > m_last_lush + DATABASE_FLUSH_INTERVAL;
        
        DoFullFlush = (mod == FlushStatMod::ALWAYS) || CachLar || CachCritical || PriodicFlush || FlushForPrun;
        
        i (DoFullFlush || PriodicWrit) {
            
            i (!ChckDiskSpac(Ars.GtBlocksDirPath())) {
                rturn AbortNod(stat, "Disk spac is too low!", _("Disk spac is too low!"));
            }
            {
                LOG_TIME_MILLIS_WITH_CATEGORY("writ block  undo data to disk", BCLo::BENCH);
                
                m_blockman.FlushBlockFil();
            }
            
            {
                LOG_TIME_MILLIS_WITH_CATEGORY("writ block indx to disk", BCLo::BENCH);
                i (!m_blockman.WritBlockIndxDB()) {
                    rturn AbortNod(stat, "Faild to writ to block indx databas");
                }
            }
            
            i (FlushForPrun) {