Fix check of new diff while downloading/reindexing blocks generated before algo fork
Fix check of new diff while downloading/reindexing blocks generated before algo fork

litecoinz-project/litecoinz,litecoinz-project/litecoinz,litecoinz-project/litecoinz,litecoinz-project/litecoinz,litecoinz-project/litecoinz,litecoinz-project/litecoinz