Fix totalMemory calculation used for garbage collection

[kladkogex]

Total memory calculation in garbage collection loop should not take into account
blockHashes since they are treated separately

To Reproduce
Set cache size to a small value (2000 bytes)
Run the tests in tests/historic_state

SKALED will hang forever in garbage collection while loop

[DmytroNazarenko]

skaled: 3.17.0-beta.11

[oleksandrSydorenkoJ]

Not reproducible without changing the cache size

3.17.0-beta.12

No crashes or hangs after removing contract with 10k key-value pairs

CacheMemoryM:12349187

2023-10-06 14:01:50.166919   Dropping good txn b3c6d1899eb080dccfb2ce758c2721557d4c19ef983ebe09b8cd768d13a7b880

2023-10-06 14:01:50.166976   m_received = 1459

2023-10-06 14:01:50.167425   Self-destructing#41ef2f90…
2023-10-06 14:01:50.167445   Iterating over the LevelDB prefix: A�/��__1��`�
                                                                            ���
2023-10-06 14:01:50.234165   Self-destruct cleared values:10007

2023-10-06 14:01:50.277758   Block sealed #74704 (#72eaec25…)
2023-10-06 14:01:50.277796   Block stats:BN:74703:BTS:1696600901:TXS:291:HDRS:11:LOGS:10798:SENGS:1:TXRS:10817:BLCKS:3:ACCS:150:BQS:1:BDS:815:TSS:1:UTX:0:VTX:288:CMM:12349187:KDS:51520
2023-10-06 14:01:50.278018   Block 74704 DB usage is 1857. Piece DB usage is 186449812 bytes
2023-10-06 14:01:50.278341   noteChanged: {chain}
2023-10-06 14:01:50.278865   SWT:112:BFT:7993
2023-10-06 14:01:50.278886   Successfully imported 1 of 1 transactions