Write the dirty block index and block-file entries to the database.
Declared in <node/blockstorage.h>
[[requires_capability(0x7fb95f04ca08), requires_capability(0x7fb969da67c8), requires_capability(0x7fb96c563218), requires_capability(0x7fb9857a02d8), requires_capability(0x7fb96cb95be8), requires_capability(0x7fb95a5b9138)]]
void
WriteBlockIndexDB();